This is a nice take on Marina; the palette has a softer and more subdued feel to it than the original game and concept art had. Kinda like she's standing in the evening sun. The only thing I'd have to say is that some parts seem to have uneven or messy lines that could do with some cleaning up. For instance, the spherical shoulder pads/pauldrons, and their associated shading.
I really like the eye! I agree with most of DrSlouch has posted below.