Excellent work!
I can see you've been staring at reference photos to get the cannon right, aint it fun?
But really, it is very detailed and anyone can see you have put a lot of work on this one. How long did you work on this on and off?
Man... I'm still trying to figure my WACOM BAMBOO out, lol.
Are you using the program it came with?
You, my friend, make me want to spend more money than I have,
Way awesome sketches!