Cinder Fall

So this is my first drawing on here that I actual made from the sketch, to the shading, to the colors to the background, all by myself. Wohoo! (the pose and proportions were based off of references from the first episode of RWBY (specifically from the pose Cinder makes right before booking it), but that's it, I didn't actively copy it like I did with my Yang silhouette)

This piece took way to frikkin long, partially because I tried some new stuff with shading and whatnot, namely, actually shading and whatnot, but mostly because when I make art, I get obsessed with minute details, I try to get things just perfect (to the pixel), but then I zoom out and that tiny, insignificant detail was actually supposed to be two inches to the left so I have to start all over again. Basically, when I draw, it's an exercise in tearing myself away from the details long enough to make the art. But I started this during a stressful part of my week and used trimming the tiny minutia as a way to blow off steam and take my mind off things so I was a little less strict about keeping myself on track. Long story short, this took about a week of effort and at least 10 hours of work as opposed to more experienced artists who would probably be able to speedpaint this in an hour or two (I'll be honest, I probably could've cut the time by a third if I wanted too, but I needed something dull and monotonous to take my mind off of things). 

That being said, while it took a long time because of my inefficiency, it turned out better than I hoped, but worse than I want (I'm a bit of a perfectionist for all the wrong things, see "obsessed with minute details" above). I hadn't ever tried making something this in depth before digitally, so I wasn't entirely sure where my skills are at. I found that it's at roughly the same level as my paper art which is somewhat decent once I actually start, and I actually bother to put my mind "onto it" (I'll probably explain how I think think about art in a later piece, but for now I'm just going to wrap my rambling up and move onto more important stuff). 

Now, despite all of my lack of faith in my skills, and this piece, this is probably my best digital piece yet, but everything feels a little off on it. I would love to get some kind of feedback/criticism on this, particularly when it comes to shading and proportions. 

(Oh, in particular, I'd like some advice on how to draw skin tones, I just colored Cinder's skin in with one color, (well, two for shadows) but it looks kind of flat, I also had trouble with denoting the edges of skin and clothes, so if anyone knows any tips feel free to PM or comment)