Her clavical (collar bone) is very prominent-- not a bad thing, but you can use line weight and/or shading to accomplish the illusion of the bone being there. (I admit this is something I haven't quite mastered m'self). Her collar bone also a little bit too high, I think.... if you get a chance, take a peek in a mirror and see where that lines up. Your drawing looks like it's slightly above the shoulders and sloping up. I think (I can't tell sitting at my desk feeling my collar bone)... that it slopes downward towards the center.
The other thing I noticed is the shoulders are so... thin. The line denoting the arm (above the arm band) goes up a little too high-- it should end just a little past the arm band. If you draw a circle at the shoulders, with one edge of the circle along the outer edge of her arm, there shouldn't be any arm lines in that area.
Something else that will make your 2D images more 3D is to round out the edges of her clothing. I do admit this is something I haven't quite mastered m'self yet... but... the thicker the material, the more protrusion you see. Leather is pretty thick.... so the if you make the braids and buckles poke out a little... and also make the ends of her arm bands curve out and around, so they look more rounded.
Her hair I have to say... I could take lessons from you on colouring hair. I'm lazy and just do one colour! Haha. Your hair is coloured awesomely. So awesomely, that I'm VERY jealous of how it's coloured. I do have one crit though... hair is "flowy" and Judith's hair seems to be almost flat and lifeless. There's a great Hair tutorial here
http://www.cablenet.ne.jp/%7ejapanime/t ... rmain.html
They also have a great clothing fold tutorial there:
http://www.cablenet.ne.jp/%7ejapanime/t ... gmain.html
I noticed that the boots didn't have any fold or wear marks in them.... that would make her less 2D.
... and shading... you'd be amazed at what simple shading can do.
Also... darker colours for items of clothing underneath... I noticed there are some "white spots"-- places where you coloured skin tone? Just think... something underneath that leather would have the shadow of the leather in that spot, so it'd actually be darker than the skin.
Zip-- you amaze me with how far your art has come in the last few years. You're not far behind where I am artistically... though, I do admit, you have far better clothing than I draw. The detail in the hair and braids is just too cool. Your proportions... the way you have Judith posed is perfecto! ... and I'm more or less a little jealous of how realistic your drawing turned out (my drawing style is sadly more "cartoony" than I'd like).
The short, graphical version: