Whenever I try to do a funky pose like that, I look at myself in the mirror. While, for you it may be harder [because you don't have breasts and well. Breasts get in the way, and such..], but, if you look in the mirror and watch how the body is naturally curved, you can get a better idea of how it will look in said position.
I always have started from the head, so that way, I can kind of fiddle with how I want the body to be posed. The head can always be looking at a different direction than the body, however, the body is always leaning in some direction towards the head.
As for my 'eye,' drawing is like writing. You don't see the mistakes you write because it is something you have written, and to you it seems perfectly natural. It is until you either read it backwards to self edit, or get someone to look it over for you that you see the flaws and are able to correct it. I, honestly, am not that good at drawing, but I go on a realistic stand point of how I draw things, such as my mushroom, for example, and my hands. I always free draw those by using my own hand to work off of.