Each week we're on the look out for the coolest comic book art that will never be printed in comic books. The reason they won't be is artists often draw sketches and commissions and post them on their blogs and Tumblrs. It's a way for them to experiment and work on characters that might not normally appear in the books they're currently working on. The pieces are simply way too good to go unseen.

Ever since Michael Walsh first appeared on this feature, he's made an appearance every week. Not only is his art worthy but he continues to post many wonderful pieces each week on his Tumblr. We've been seeing a lot of teasers for the upcoming Spider-Man/Doc Ock event, Ends of the Earth. Check out this classic-style image of the two.

That's not all he's posted. Check out his version of Skinner Sweet and a commission request he got for M.I.A. dressed as Wonder Woman.

Dustin Nguyen has been experimenting and posting different things on his Tumblr. Be sure to check them out along with these two Bat-related pieces.

Remember when we did our Art Challenge with several different artists, Catwoman as a Green Lantern? Freddie Williams II posted a commission he was asked to do. Jason Todd as a Red Lantern and posted it on Twitter.

Speaking of red, Paolo Rivera seems to constantly get asked to draw characters with a red theme (besides the fact he's drawing DAREDEVIL) and thankfully he posts them on his blog. Check out his version of Carnage.

Since we're on a red theme, how about another red-head, Scarlett along with Baroness by Phil Noto?

Phil also posted this Age of Apocalypse Nightcrawler on his Tumblr.

Mike Mayhew keeps busy during the week. He's posted a few different pieces on his Twitter as well as his Comic Art Fans site. Check out his sketch covers that he does as "morning warm-ups."

Joel Gomez has posted several card and cover sketches this week on his Tumblr. Definitely keep an eye out for his convention schedule to find out where he'll make an appearance.

Agnes Garbowska is another person you should look for at conventions. Her art (and personality) will definitely brighten your day. Check out her robin following Robin, Star Wars sketch cards and Lumpy Space Princess! Check out her Tumblr for more.

Peter Nguyen is getting his convention schedule ready. He seems to be working on a big piece and posted the beginning of it on his Tumblr.

Todd Nauck posted another character sketch on his Tumblr. This time he drew Magik.

Gene Gonzales posted this little sketch last weekend on his blog. He referred to is as a doodle but this is what I love about artists. They can just whip out a great sketch with minimal effort. Take a look at his Zatanna.

We're going to round out this week with some more Robert Atkins art. He posted a few pieces on his blog.

That's it for this week. Let us know what you thought of these selections. Be sure to check keep an eye out for all the awesome art on the internet.