I was going to post this to the creativity thread but as this one doesn't explicitly say "human" anatomy I figured it would go here.
Oh yes, learning animal anatomy is EXTREMELY helpful.
Regarding the Panzerwurm, try to remember that mother nature is obsessed with efficiency. If the animal can get away with not having something, evolution will direct its resources to something else. Consider the roles of the following: the rib cage is a flexible shield around the organs, the plates a kind of inflexible extremely heavy armour, the spikes a repellent defense. Does the animal need all three? Think about how much
bone that is, bone is kind of costly to grow. If you remove the most expensive and redundant element, the heavy plates, it seems much, much more realistic, in my mind.
A similar question could be asked of the legs; does it really need 6? Could it get away with 4? Dinosaurs got away with 4, even 2, despite their immense size.
I don't know if the bone structure of the fore-legs really fits their role. The animal is basically going to be walking around on them at all times; their role is as a structural support. The arrangement you have now is more for accomodating a lot of twisting, something more appropriate for manipulators like arms. Look at how much stronger the back leg is, how much better it serves its role as a support.
That's all I've got for that. Definitely check out some dinosaur stuff.
I've been doing a whole bunch of sketching, I'll share some;
Drawing from reference, about 15 minutes at it before I had to leave home and go to work
Just some general practice with hands, from ref. I was kind of more focused on my line work than the anatomy though
Trying to recall all the back anatomy stuff without reference. Stuff in red are MISTAKES.
These are two half-hour classes I did from
this website (really awesome site, do recommend!). Uber large images, so I'll just link them:
http://i188.photobucket.com/albums/z212/gastrop0d/sketches/00.jpghttp://i188.photobucket.com/albums/z212/gastrop0d/sketches/01.jpgI've also been doing at least an A2 page of 30 second gesture drawings per day on traditional media. Really helping me with lines and speed. Still a loooong way to go, though.