Art Trade Rock the Mummy (Halloween OC Swap)

I really liked this character from the first time I saw it. It has distinct features that help it stand out. I really like the bold choice of skin color and the pose. I can tell that you've put a lot of attention into it. The bandages with the texture and the different light sources all look very meticulously drawn. 
For me the main thing that could be improved about it is the color scheme. I don't think that the background really fits the character's color scheme. It's quite bold to use different colored light and so many different hues in general but they are all too saturated and clash with each other rather than work together. If I were to change it I'd keep the vibrant color of the character and tone the background colors waaaaay down, maybe even get rid of the blue and just keep the green and yellow but as very desaturated versions. or you could make the whole background a desaturated blue and just slightly suggest the light sources from the two sides. 
Other than that there are some specific details that I'd tweak. For example, the fingers and the hair, as the person before me said, could use more work: the hair in terms of texture and the fingers in terms of shape. I'd definitely recommend using reference for the hands. 
The gem is a really nice touch, though it should have sharp edges to suggest the smooth surface. The cloudy, blurry highlights don't really work well there. And lastly, the back foot - I'm not a fan of the heel-look. It would look much more natural if it's on tiptoe, right now it looks like one of those wedge-heeled boots.
I hope this was of some help to you. Keep on experimenting with colored light, it definitely gives your drawings another dimension.