Yep, I am with eishiya and curly, it is much better. Those tiles directly below the green ones, which look like they have some kind of statue carved in them, I would try to make them as dark as the darkest portions of the stairs. I would keep about that level of value for all walls.

Also agree with eishiya in the shadows on the stairs, they should zig-zag between being 45° on the horizontal-bright portion of the steps and 90° (vertical) on the darker portions that are vertical.

The mage is cool! You really applied what your learned from Ryu's edit . Tiles, what curly said above. Let me try to help a bit:

Before texturing anything you should try to have very distinct shades to represent vertical planes (darker walls), horizontal planes (floors) and inclined planes (ramps/stairs). If light comes generaly from above, walls should be darker, floors should be lighter (because they are facing the light more directly), and ramps should be somewhat in between. Of course, when detailing a scene not everything will be made of the same material, and some materials are inherently darker regardless of shading (dark stone vs bright stone in your case) but first get the basic values straight, then variate latter.

So what I am suggesting is that, at first, you try to draw the scene with mostly flat color tiles, maybe just some outlining, to get a feel of the 3d shape of the scene. If you have trouble defining a scene with very flat shaded tiles, then the texturing will only make it harder. Chances are that you will spot some geometry mistakes that you were not noticing before because of the distractions.

After that you can start to cast the shadows on the floor, and then texture over the values that already give an idea of the basic 3d solids the scene is made of.  As a rule of thumb, the texturing should be less detailed than the characters, so they stand out over the tiles.

Stello, I just saw Knights of Tartarus on steam, looking good, congrats

The gait looks a little jumpy on the hind legs? Don't know much about quadruped gait but I suppose you have some reference for this one? Maybe the head on the last update could use a little more mane like the sketchs, but I like it in general and it fits the style.

Dude, I am out for holidays but I can color-reduce it after when I get to my PC.

Meanwhile, you can try to take the colors that are most close to each other and merge them into one intermediary color. Do it a few times until every color is different enough from the others.

I remember the piece you posted, and it looked alright regarding color balance. Just cut out too similar colors.