More awesome Sonic CD art.  This piece is by liquidshade and it’s a beauty.  He actually talks at length on his process, so I’m going to be lazy and copy-paste:

The characters took ages to get right, then I had to outline them, then I had to re-outlight them because I wanted the lines alot thicker, but in the end I’m satisfied with that thick black outline and cel-shaded look. I was gonna try soft shading, which probably would have gone better with the un-cel-shaded background, but that just looked a bit tacky. When I used to buy the British Sonic the Comic as a kid, they always did Amy with her spikes up, like I’ve drawn them here, but on more recent investigation into official pics, old-school Amy’s spikes are actually more like Sonic’s, and are only up in one particular pic, where she’s with Sonic. The poses in that pic are similar to how Metal Sonic is holding her though, so I figured they’d be better like that anyway. Speaking of Metal Sonic, that’s probably the best pic of him I’ve ever done, and all his awkward shapes and limbs ain’t easy to draw. I’m not 100% happy with Sonic’s pose, but I suppose it’ll do. The background only took the last 2 days to do, and even though that rough look and technique isn’t normally me, I think in the end it came out rather well. I used screenshots to get those Palmtree Panic cliffs just right.

The only critique that I have for it is that the color of Sonic’s mouth and belly region look sickly.  Otherwise, it’s bitchin’.