The coloring is extremely impressive.

The colors work really well together, especially the black background and the yellow/orange/red of the fire. How did you draw the fire?

Anyways, his coloring and design are both very neat. Is He an OC? If so, you're very creative and good with design.

The shading, I think, is perfect. I especially like how you made different colors fade together. Although I don't think that some of the shadows should be purple.

The little details in your picture (the rocks and cracks in the ground) really help make the picture pop. I think, to make it more real, you could have added a little more of them in.

But otherwise, good job!

I really love the dynamism posed in this one. Really epic lighting, I especially love your special effects. I love that you chose complimentary colors for the shadows too, however, I feel that the overall lighting is incorrect.

Your light source is the fire, as depicted by the cast s hadows, however, your highlights and shadows are not on the right sides. If the light is coming from behind like that, there'll be a rim lighting around him, and most of his body that we see will be in shadow, save the reflective lighting. Take into account lighting direction. If you want a good practice, run up a real quick dummy in 3DSM or Maya, and give it the similar lighting; Just a spot light from behind and study how the lighting reacts to the form.

Other than that, the technique's all there. I like that you take risks in lighting it so deeply. The highlights are looking very saturated which makes me wonder if you've used a burn and dodge technique? If so, I recommend you experiment more with complimentary shading like you did in the cast shadows, using opposite or even darker tones, for the shadows instead of black. Otherwise, it's looking great! Can't wait to see the edits.

If you need, I can always run up a redline critique for you too to help you with directional lighting.