General Grievous Wood Burning

This is general grievous (more specifically the Genndy Tartakovsky version of grievous) and I burned him into a hunk of wood. My moms boyfriend does a lot of woodworking, and he's been really encouraging with my art and he thought I should bring it to a block of pine. This is the first wood burning I've ever done, so I'd like to know how people think I did for a first timer.