Have you considered color? The whimsical doodles seem to beg for some coloring. I like how the planets are drawn somewhat like the planets in Le Petit Prince and Super Mario Galaxy. The kitties are so cute.
I have allot of this doodles that I make when I'm bored..Problem is, coloring takes 10x more time than drawing, that's why I have so much art in b/w.. + I suck at coloring, and doing it may ruin my drawings :I