This was from a Dragon Quest 2 rpgmaker remake I was doing last year, with a revamped side view battle system. I did these with the original palettes, mostly just for practice. Please use as you'd like.
I do like the shading on the slimes! As for input, I believe you should take more time into the sprites, take as long as you need. A tip would be to observe the shading of the original image, then start drawing.
These may need a bit more work, but i took another wack at these recently to work on improving skills. Heres a link to them. http://samuelnolen.deviantart.com/