why mirror your lineart if you're going to actually shade the whole thing by hand anyways? This is a weird, boring pose for an oddly shaped character with strange wing and face structure. You need a more dynamic, interesting pose that isn't just a coloring book, straight-down-the-Z-axis cookie cutter projection! Also, before you dither, and split up all your colors into completely separate ramps, I would recommend roughly coloring your image with just a few shades of gray, to practice your lighting and figure out the volumes, and then start building up your colors in a nice, organic way, only adding new ones when you need them. Boots are not always brown, crystal balls are not always blue - even when they are brown and blue! Light and reflections change the color of the surfaces we see, and if you start to mix your hues more you will be taking a step towards that phenomenon.
My advice (which appears to be harsh as usual) is to work on a more interesting pose, and then work on a simple value study (i.e. a rough, grays only coloring pass). THen you will be ready to start working on selecting colors, and adding dithering, etc.
You can't build a house on a cracked foundation!
