I like the composition here so far, make sure to make the bg compliment the dude in the front.
I would say that your lighting and color usage falls into a very common trap: you use a lighter and darker shade of the object's base color for your shadows and highlights. Unless the object is in a completely light-neutral surrounding, highlights and shadows usually have a different shade/color from their base object. Color theory is your friend here, study it! The anatomy and lighting themselves are fine, but you should try to increase the contrast between the shadows and highlights to really make your image pop!

Oh and also; try to start your drawings by putting a neutral color as a background. Using pure white will mess up your sense of contrast. Also, study objects, people and anatomy from real life LOTS. If you have a good understanding of construction and anatomy, you will know if you need to change something!

Although I'm in baby shoes myself, you could check out my gallery to see what I mean about using different shades and colors in lighting.

its a nice blending style its good enough