Green Hill (Classic)[link]
Green Hill (Modern) Boost [link]
City Escape (Classic) [link]
Total of 7 days on this (a full week, 2 days just to draw the image).
Well, I had to do SOMETHING for Sonic's 20th, so... here we go. I kinda combined the Sonic Generations console Green Hill with the 3DS version here.
Nothing particular fanshy or anything. This ain't as insane as other 20th pieces I've seen around here but meh, I wasn't going for super detail.
And check out these other awsome pieces that are Way Past Cool:[link][link][link][link]