mikolajspy wrote:I somehow can draw hands with sketchy pencil on paper, but doing digital lineart seems to be still problem. But I'm thinking about doing some workaround like the one in image below. Drawing hands in front, back or side looks fine to me, but in perspective and angles doesn't.
Damn hands, how often I create monstrocities or sausage-fingers when I try to make them. Hands are very hard to make well, but try to remember that few people will notice it (when the hand is not above chest-height). Go back to games you played and whose sprites you enjoyed, and study their hands. Either you'll notice how awful they look and that yours don't need to look perfect either, or they'll be good references.
mikolajspy wrote:And yes, she's one of the main characters, other's won't have so much expressions, clothes etc. and other characters will have similar style (or at least I'll try to keep style consistent with other characters, backgrounds and event illustrations).
Restricting expressions might not be necessary. I usually give my characters four mouths, four eyes and four eyebrows: mouth smile, sad, laugh, shout - eyes normal, scared/angry, look down, look side - eyebrows normal, sad, angry, frown. It's quite easy and quick with the simplistic expressions that you and I use, but it does make for 64 expression combinations.

Especially if you put the eyes in layers that allow for easy manipulation (eye white - iris - eyelashes, then copy paste drag the iris.) and cheap out by making the frown by copy pasting half of the sad or normal and half of the angry, it's done in no time. With those expressions you'll probably will be able to do whatever you want with your support cast, unless the character has a personality-related expression they really need like pout or grind teeth. Your main cast might need some more expressions though.
mikolajspy wrote:I also have question about flipped versions: should I shade them again from start or can I keep them with flipped shading? Would it bother players?
It can annoy people indeed, but I'm not sure if your shading would even be noticeable. I've seen a thread about that around here some time ago, a shirt with text on it (which was mirrored in the flipped version, rather than being corrected) is most definately not acceptable. With your sprites on the other hand, only the shadow under the chin and the utmost left/right seems to be an issue. If you split the layers you can probably make a flipped version rather easily, but I doubt people will really notice it if you don't. I'd say it's up to whether you deem the effort worth the gain.