I like doing these fast creatures - 3 hours on this one - and see what I can achieve in a short time. It keeps me on edge and active.
I hope to start Monsters By Email
this year (perhaps very soon) and while those creatures take substantially longer, and are more thoroughly designed, it is good practice doing quick creatures now and then.
Are you on the Monsters By Email subscription list yet? If not, check it out here (several free sample available)