also so try the biorust down load centre there is a free download "resources"
it's in photoshop brushes page 6
it might help you with your pixel art
it's called uncle gheds pixels
it's says "a unique set of pixel brushes designed to make your pixel graphic
compilations that much easier to create
BioRUST.com :: Downloads >> Adobe Photoshop Brushes
also try this isometric pixel art in the biorust tutorials
BioRUST.com :: Photoshop Tutorials >> Basic Principles