An interesting Witchblade illustration. I like the motion you've got through the hair and the spikes coming off the right shoulder there, parts of the colouring are also working well, I like the coloured line look you've got going on!

The pose, although a little static, is not bad, it's not too mirrored, but I feel there are some problem areas which are rather letting the side down a little, the worst offender being the arm on the left there, it's bent at an awkward angle and feels very flat in comparison to the rest of the image. The hand is also not very well drawn, and the ring finger on the other hand is longer than her little finger! -But that's nothing a little bit of photo referencing/hand anatomy practice won't fix! - I actually sometimes work with a mirror or a digital camera by my side, when I'm drawing a hand position I can't easily copy from my own hand pull the shape I want and look in the mirror - or if I can't get the angle or pose right I take a picture and draw off the screen, this technique might help you. Another distracting problem area is her left trapezius, the muscle near the shoulder above the collar-bone on the right there, you've certainly lost some volume there and it makes the connection between the neck and the shoulder look wonky/anatomically flawed. - Again, referencing (either you own body, or one from a photograph) can really help with tricky areas like this. Another tip is to "mirror" the drawing, if you're working in real media keep a mirror by your side and look at the drawing's reflection from time to time, this can be a useful way to help you pick out problem areas that you hadn't spotted before because your eyes get used to looking at the drawing - of course this is easier if you're working in photoshop because you can just horizontally flip the line-art instead - its' a great way of effectively getting a fresh view of your work.

The colouring is nice, I notice you've got some subtle colour variations across the skin tones which is good! don't be afraid to make more of this, skin around the cheeks could be tinted with more pinky red, while under-arms and belly tend to be paler and lighter. Again, with the same with the metal parts, really emphasize those highlights and shadows to give a convincing reflective surface, and experiment with pulling some of the oranges and yellows in from the background... you'll be surprised with what colours you can get away with using! - especially around that red light on her hand, why not bring some of that red into the reflections on the armour?

I like your use of a yellow keyline (the line which goes around the edge of the figure) and you've paid some attention to colouring parts of it which is effective - look out for keylines around points like hair tips and spike tips, I find it better to sharpen off the keyline to match the shape of the object, instead of just leaving it blunt like this. The blunt keyline can have the effect of deadening the shape of the tip.

The only other thing I'd like to pick up on then is the line details in the metal part of her arm, I think you'd get a much stronger impression of form in that forearm if the lines curved around with the shape of the arm instead of being dead straight across it - you'll find it gives the arm a lot more form.

All in all a character illustration with a lot of potential, just a little more practice needed in certain areas to bring this up to a more professional level!