Something I noticed about this and the other animal girl characters is that their clothes seem almost painted on, which seems very weird. In particular, the fact that their pants/shorts/whatever seems to be clinging to their vaginas seems a bit off, imo. Likewise, their nipples being so pronounced even through their clothing also seems odd.
That being said, all four designs are still highly attractive, so excellent work there. Just pointing out some oddness with their clothing design.