I posted some of these over at Sega-16, and I figured I'd start a similar thread here to share all of the game-related artwork I have done and to see what other people have (hopefully) done.
Here are some drawings I did of Sonic shortly after he first came out. These Sonic drawings are all a bit water damaged and also very large. I had to scan them in 4 passes each and then reassemble them which is harder than it sounds since the drawings can't lay perfectly flat on the scanner as a result of their size. All drawings were inked and then finished with thick colored pencils.

This is basically just the box cover for Sonic the Hedgehog. I like my style better, though.

I did a variation on the cover for a game store called Power Play Games. This hung on their front door for well over a year. They were where I rented all of my Japanese Mega Drive games loooong before they came out in the US.

Here's one I drew when I was anticipating the release of Sonic CD. The Sega CD logo at the bottom sucks because I do not draw the Copperplate Gothic Bold font very well. Why I made it green, grey and orange is beyond my current comprehension.
Here's the non-Sonic stuff:

Ghouls 'n Ghosts - This one bothers me since it is a cutout placed on a black board. I guess it looks alright, though.

Thunder Force 3 - Based on the Japanese box (which is nearly identical to the US box) at the time of its release.

Thunder Force 4 - This one is alright, but it bothers me because it isn't symmetrical.
And now for the black and white stuff, all done with a mechanical pencil:

Shinobi - I like ninjas.

Revenge of Shinobi - Yeah.

Shadow Dancer - I really like this one a lot... except for the hands.

Ys Book 1 & 2 - The face bothers me quite a bit. I was not very adept at drawing the female form at the time.

Dracula X - Here is a gigantic drawing of Dracula X that I never finished. 4 passes with the scanner weren't enough... I'd probably need 9 passes to get it all. I'll likely never finish this drawing, but here it is anyway.