Shells in white and black

This is 11x17 practice of a still life using charcoal. I say practice because this was just me getting used to charcoal and how to create shadows and shades etc. The artwork is incomplete so that is my main issue with it. What i did finish though, I believe actually turned out really cool. You can see the texture in the shells and the gradients are there, so for a practice I was happy with it.