Original here:

http://opengameart.org/content/fossil-undead-rpg-enemy-sprites

by Redshrike.

I simply cut the elements out of the sprite, tweaked them and put them on a single sheet. Walk cycle, battle, a red glow effect, opening mouth, crouch, run, clawing etc. is enabled by cutting and pasting the elements from Redshrike's original.

I also cut up the tail bones to enable some flex and movement, to make that look good definitely find some references of lashing tails. Or, keep it stiff like "real" dinosaurs supposedly did, and use the tail bone elements to keep the stiff rudder like tail consistent with the model's movements.

If you like this, you should visit and thank Redshrike who did all the real work. :)