Gengar used Shadow Claw

This picture is a couple years old, but I recently went back and retouched it with some new techniques I've learned since then :3
This is Gengar using Shadow Claw, well at least my interpretation of what it would look like when Gengar uses the move.
And yes, that's Lavender Town in the background, specifically the Pokemon Tower.

Please comment and leave any suggestions for which Pokemon I should draw next and which move :3