A simple practice drawing it might be to you Megan, but it looks really good. Now all it needs is the reflected light to make it even better.

Most surfaces reflect light onto others to some degree, just depending on how smooth and light the surface is.

If it's yellow the surface will reflect yellow light back onto what other surface it's reflecting onto.

take the ball on that box (I know it's black and white) :) but just take a putty eraser and lift a little of the graphite of each surface where the reflected light might be.

This makes a shape even more three dimensional. :D I love your art, and that lion is beautiful.