I sold off my collection of about 10,000 comics a few years ago because I did not want to move with them. I switched fully to Comixology about 8 years ago and have not regretted the move in the least. I started buying original comic artwork about 15 years ago and still dable in that. Here are a few good pieces for you to enjoy:
Civil War page by Steve McNiven
Kraven and Punisher by Mike Zeck
Silver Surfer 34 (Return of Thanos) by Ron Lim
Thanos Commission by Frank Cho
Thanos by Jim Starlin