In order: Percy Jackson, Luke Castellan, Leo Valdez, Hazel Levesque, Frank Zhang, humanized!Festus and Octavian.
All of these can be found in my gallery at deviantart and in the "my art" tag at my tumblr.
There are more of these coming. I've got Nico and Reyna drawn, with Nico in the process of being colored and Reyna sitting in my sketchbook, waiting to scanned. I am taking suggestions on who to draw next because I can never decide. XD
Who should I draw next?
Clarisse la Rue
Rachel E. Dare
Bianca di Angelo
Travis & Connor Stoll
Some of the gods (comment)