I kind of like the big round eyes of the first three. Somehow it gives the character more personality and life. They are all fun though!
Matt, I'm really partial to the first 3 illos, though it's tough to say why exactly. I think they just feel more finished to me. I like the visual style of the second set but they just don't seem to have the same level of polish.
Thanks for the input. I'm just trying out some different techniques, but I have to agree I'm more partial to the first three. If I get time I think I'll redo the last three with the style of the first. just to see if I can get some consistency.