Tickle Aliens

These are some rough character sketches for a children's book I'm working on with a friend ( he writes, I draw). These aliens need laughter for survival so, they have evolved into very good ticklers and earth seems to have many ticklish people , the perfect energy source.
Ive never done much cartooning but I'm enjoying doing these. I'm finding it's affecting my mood to do these... in a very good way.