the mockup makes it clear that you should make some easy tiles to smooth things together—notably outer curves for the cobble street the cliffs, and some tiles for overlapping trees. (and around the water too, but I think you're probably getting to that anyway)

also seeing it like that the cobble is very repetitive to the point of being annoying on the eyes—though i think you've already noticed that yourself. the same with the sand tile—i think that texture/pattern is adorable but it could be spaced out a lot more (sort of like how you are doing the grass) so it doesnt seem so repetitive.

the dark grass on the right side seems weird the way you have it there—i hope that it's just there to show off the tile in the mockup

overall these are looking sweet. i absolutely love the clean style. keep at it, man.

exaggeate!! bring that arm back more, really stretch the bow out. maybe have him move his torso. there's like no power in that at all, man.

It does have issues with the top edge and possibly perspective.  It doesn't look like a rock you could feasably walk on.  You'd need to imply that there's flat stable ground you can rock up top the rocks (and would also help with the desired shape).

i thought the same thing as this, man.

my question is: how big will the character sprites be? walking on these will be really awkward. i would suggest bringing them in tighter or adding smaller rocks between them to create something a little more walkable.

these rocks look like a great starting place, but they don't really create a floor on their own.

in....

what i would love to see would be sprites or a game mockup based on The Wire, the Sopranos or Breaking bad.

if my santa's not familiar with those then pokemon is always an alternative.

I love that dirt tile, man (i'm gonna use that for ideas with some ground tiles of my own that i've been stuck with if that's cool with you). And that water looks great—where the dirt and the water connect really works—it looks like a muddy little stream. Sweet job there. Are you gonna post an animation of the water? I'd like to see it in action.

There's something about your greenery that bugs me, though. The grass and the trees—both of them have a kind of sharpness that could work on its own, but doesn't fit in with the solid ground tiles. Maybe it's in the colors. The grass in particular: it tiles nicely but it doesn't seem to blend tonally with the other ground tiles. I have the same problem with the tree trunks—they seem really sharp. normally i'm all over high contrast, and i think what you have is good, but if you can blend them just a little bit more it would match the floor more.

i guess that's the thesis of my criticism: your grass and trees don't blend into the ground as nicely as the ground and water blend into each other. the result is a kind of jarring mishmash.  can you try re-using come of the colors on the trees?