James Ulmer does quirky, offbeat illustrations, which I feel are in the same vein as Amy Brown’s. These two prints are my favourites from the freelance illustrator who’s living in Philadelphia. His website is still under construction (but you can see some of his illustrations there), but hop on over to his Etsy store to see more!
EDIT
James has since updated his website. Thanks for heads up, James!
From top:
Bicycle Built for Two (USD25); Happy Day print (USD25)
I love these! So happy and carefree and fluid. I’m definately off to check his website right now!