Really like the poses you drew them in, it's a challenging angle and not something I've seen you draw much before, at least not on this scale. They look like they're existing in a three dimensional space.
The biggest issues I see are anatomy in the limbs, especially on the bottom creature. What I would suggest is to look at your own arm in that pose to see how the reptiles 'push-up' arm position relates to your own anatomy (and the same for the back legs). The forms themselves feel like they're in perspective but their positioning seems unnatural.