Not sure if this is the best forum for feedback requests like this, but it seemed the best pick.

Ok, so following my Zelda-style cave set, I have a need for a Zelda-style dungeon set. I've always loved Redshrike's dungeon set (https://opengameart.org/content/a-load-of-overworld-34-rpg-sprites) so I was rather happy with the recent derivative (https://opengameart.org/content/underworld-load-comprehensive-top-view-rpg-tileset-32x32-some-16x24-16x16). Unfortunately, I couldn't use them as-is, because I want to combine them with LPC assets and the colour-count is just too high to look right (and I didn't have any luck reducing the colour count and recolouring it while still making it look good), and besides, I wanted it on a somewhat higher resolution. No matter, I traced over the original and made a reduced colour version using LPC colour ramps.

So far so good.

Now, I want to modify the tilesets further by recolouring in different colour ramps and changing the details on the tiles. Think Ice Dungeon, Lava Dungeon, Haunted Castle, Forest Ruins. The first one I wanted to do is a dungeon in a forest. I want weathered stones, partly covered in moss and some vines. Think is... I can't get it to look right.

The attached image is what I've been able to come up with and it's a bit crap. I know how to improve the stones, but I can't make the plants look right. I tried finding some tutorials and examples, but they haven't helped. If I try to do something similar, the end result to me just looks like I tried to put some random green pixels in there.

So I'd really welcome some suggestions for how to correct this, or pointers to useful resources I have missed. Thanks!