Etrigan, Jason Blood sketch

This is a quick sketch I did. I'm just warming up, really. I want to draw more but before I do another drawing where I take the time to color and shade, etc., I want to work on my craft. So I'm going to start sketching more. This is just the first warm up, I plan to do more with more posing, male and female characters, etc.
The end goal is to be able to produce art I'm happy with.