okay, this is a wonderful piece, but just like any other piece of art, there are down-sides and good sides; and if you don't mind, i'll be basing my critique on slight preference. lets start with what i find attractive. the line-art seems to be your strongest point, very defining, with this line-art you KNOW what you're looking at. (if that makes sense ) I also am a fan the the anatomy in this woman, you exaggerated certain parts of her body to make the drawing suitable, such as the neck, breasts, and waist. Now, lets start on what i find to be unattractive; shading. while the shading in the body of this woman is quite good, features such as the hair, background, cape, are not the best. in my opinion the hair was the worst of this issue, it isn't exactly a "horrible" but it's certainly not the best. the highlights cancel out most of the actual shading, removing depth; same goes for the cape she is wearing. another thing has to be the way it was originally drawn, very stiff, no movement or flow whats so ever, and to me i find that to be a bit boring. she his in a fixed position. i mean, come on! shes Bat Girl! try working on action poses or maybe a sly or relaxed pose, but not a head-on perspective of a woman standing still. Overall, not bad, i know you're capable of drawing VERY well so with every piece, try to "one-up" yourself. thankyou.
Ah DC comics' chicks, one of my favorite subjects.
Okay so I think overall you've got an excellent grasp of anatomy. The pose looks excellent, believable, and fluid, and there are not proportional problems that I can tell. Nothing looks stiff, or too straight, or non-feminine either. You've got a better grasp of anatomy than I do I think though, so there may in fact be something off that I'm not seeing. The good news is, anatomy is the hardest part to learn in my honest opinion, and I've heard it's the most important thing to be able to showcase properly in art portfolios. You've got that part down, there are just some minor technique issues that may want to be worked out.
The biggest problem I see with this piece are the lines. Most of them look good, crisp, and clean, but there are definitely a few areas where they're not quite right and that can really throw the viewer off even if they're not looking at those areas directly. The main area that bothers me for this are the bat ears on the batarang. The lines between the outside of the batarang and the border around the top of it get too close together right at the ears for the images resolution to compensate. This makes the light blue space between them look jagged and inconsistent due to pixelation, which subsequently feels a little sloppy, even if it isn't.
Another area of the line work that bothers me is right at the bottom of the cape on the right side of the frame. This might be more of an impact issue than a line issue, but all of the shapes and lines just seem a little too bold and flat in that area. This is also the issue with the shading on the forehead I think, making it look a bit too two dimensional instead of rounded.