Quite a while ago drolph posted a link to posemaniacs. Id seen this site in passing years ago, but had completely forgotten about it. I decided to flick through the female poses and find some similar to the pose ideas in my head so that I could get a better perspective and rotate it to find the best angle. I chose a few and then drew over them in photoshop and made them look fat; most of them look like heavily pregnant women... but it gave me a better indication of the best pose.
And like everyone else, I analysed the bone structure in order to get a better understanding of how I might have to change in order to turn into a walrus.