I think the wave pattern feels very repetitive, even more so in motion. Using smaller waves would make it easier to hide the pattern. Alternatively, you could "stack" waves

Yeah, I think I'm gonna have to draw this again.  I might keep it for use in some area though, where it would look better to have "rushing" water.

You have some highlights in the water that are almost static, they look unnatural.

Highlights in water actually are very static; they just glimmer but they stay in the same spot.  So I'm not sure what highlights you are referring to.

I'd have the water fade in colour more gently. I'd go into the second colour only slightly below the waves, and then fade from there to the darkest colour. Having a big space of light and then fading to dark suddenly makes it look like a shadow on a tube, rather than darkness in transparent water.

I was going for having a dark portion just at the bottom to signal to the player that they die if they go down that far, but yeah, I don't need so many color transitions to do that.

A critique I missed on the ground last time: The dark background dirt tangents with the corners/tops of the platforms. I think it would look more natural if it didn't, but rather came out of the sides of them, or went above them in some cases, e.g.

That looks a lot better; Imma do that.

(Also, while I was editing, I noticed you seem to have some semi-transparent pixels on the edges of the background rocks! Might be left-overs from when you sketched stuff in first? IMHO it's best to sketch with pencil tool, so your colours are under control and sketches easy to get rid of.)

I see what you're talking about.  It's actually on a separate layer; the same layer as the tree sketches, so its really gone already.  (But thanks for pointing that out; I would have hated to have left that in the final version.)

Your character doesn't appear to be standing on the tiles, the way the feet are shaded makes it look like heels are higher up than the toes.
Another common trick in games is to not outline the bottom of the characters' feet when they're on the ground. This eliminates the appearance of an underside/shadow, making the feet look planted on the floor rather than hovering just above.

I never really noticed that, but I do see that in many of the examples I have on-hand.  I'll keep this in mind when I get back to drawing character sprites.

This ground doesn't feel very "foresty". The light colour suggests sand rather than the sort of soil full of decomposed leaves and wood that most forests grow in. I'd expect this ground colour in a prairie or desert area. Try using some darker colours

Okay, I'll try that.  But I think I should get the trees and other elements in before I make any major changes to the color, because I'll need to see how it balances with the other colors.

Tamara reveals her true form!

One of the things that keeps getting me is, exactly how is the player supposed to be interacting with this map?  Should you be able to see little people walking around, or little trucks or wagons roaming around?  If that's the case then the view is simply pulled back too far.  Even if the player is just selecting large blocks of land to be mining, I'm wondering if something is supposed to be shown to the player, like a little road that gets built to the mining site, or little buildings or equipment.

Honestly, you should start with those kind of elements.  Because right now, we are really missing a sense of scale.  That river could be half a mile wide or some tiny creek.  Are those rocks or hills or mountains?  Are those trees at the bottom, or sage brush?  If a person was walking around here, would they be too small to be seen?  I really have no sense of scale, and if you're making an actual game and not just some art, that's going to bite you down the road.
So try drawing some of the things the player is going to use when they interact with the map, and add a few items or landmarks to help establish your sense of scale.

After that, well it's hard to be specific since I'm not sure how big any of these things are, but there is a lot of uniformity in the width of that river.  Take a look at this image I found.  A river looks more natural if it has more variety in how wide it gets.
And unless those are rocks just sitting on the ground, then those mountains don't blend in well.  Mountains don't just pop up on the plains, they form ranges.  It makes them a lot trickier to draw, especially if you want to reduce the number of tiles you are using,  but if you want good art you have to put in a lot effort.  It's just the way of things.
The angle you are using is also making this a little tough.  The mountains themselves look like they are being viewed directly from the side, but then everything is arranged like you are looking directly overhead.  Try to imagine everything from a slanted angle.  Look at some isometric art; do a google search for isometric desert and isometric mountain.  You don't have to actually build the game in an isometric format (although that would be suggested if you want a more 3D looking map) but natural things like mountains and rivers and trees look the same from an isometric view as they do in a tilted view, so those kind of samples should give you some really good ideas of how you want them to look.  Here's a good one.
And finally, vegetation tends to grow in predictable spots in a desert.  Near rivers, and in basins where the water collects, and wherever the runoff from the mountains would gather.  Keep that in mind.  Add some greenery near the river and in the flat areas near the mountains.