First thing I recommend making multiple layers one for Background and one for lines, it just makes life a bit easier when doing drawings,
All right So here are my notes,
when you first start drawing her I recommend making a layer specifically for a sketchy outline like thing where you can do a rough draft of your drawing to make sure your proportions are correct.
Your thighs should be a bit closer together and a bit thicker as well as add small curves for the knees and curves where the calves would be.
She should all so be a bit shorter which would help with body shape as well as her legs.
As for the arms I did a model-ish thing for you on my redline layer (though I must admit my arm should be a bit thicker).
Other than those few things I think your doing really well! I love your style to!
Thanks for letting me do a redline for you! Hope you learned some things from lil O'l me, and if you ever have any questions feel free to shoot me a PM!
(Btw, if you could leave my name on this so I could still color it in in a little while I'll re do my redline with my drawing tablet (had to do this with my mouse) which would probably be more helpful for you!)