I see you've figured out my style! Congrats! Absolutely wonderful. If I can make one suggestion: make a light outline in pencil first. It's easier to erase and then coloring in charcoal isn't much of a hassle.
This is outstanding for a first try! Umbreon is my favorite Eeveelution BY FAR, and I am thrilled to see someone do such glorious charcoal art for it.