User blog:Rapidthehedgehog/Art Help

Hey SFW. I'm tired of looking at my character pages and seeing no pictures. I know what they look like, but I want to visually present them to everyone. I was wondering...what's the best  FREE art program out there for making Sonic characters?

Side note: I use a MacBook with Maverick installed. This is the latest update (I believe) so any Microsoft-based software isn't going to be useful.

Second side note: I would be very appreciative if others could do art for me, but I understand that not everyone wants to and not everyone wants to do it for free.

Please help, guys! Thanks!