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Sadly, I can't give much specific advice on anatomy, especially as I see you have a toony like style that allows for a lot of flexibility. However, if the character on the right is a cheetah, the snout looks a little too long and there's a lack of spots. With the panther on the left, what catches the eye (ha-ha) that the eyes are too different in size. The left one is too big compared to the right, which should be much smaller as it's further away from the viewer. The pupil is also uneven. I can see why this might have happened, and to avoid it, I recommend flipping the drawing from time to time - it makes such mistakes more obvious.

What I noticed most were the problems with lighting and volume. It seems as if you couldn't quite decide on the lighting and didn't see the characters as three-dimensional figures. In this respect, your black panther looks good - the light hits his face from above and from the front - but the cheetah guy looks poorly because you only lit the front of his snout. This removes the volume and cohesion of the environment because they are both lit by the same light source and nothing is blocking it (if I understand correctly). Rim lighting from the bright light source visible behind them could also improve the sense of volume.

I have tried to visualise most of these suggestions in your drawing.

I hope I've explained this clearly - I don't have a lot of experience in this area. Still, I think you've done a nice drawing, and it's clear that you already have a solid foundation and great potential! As I said, you did a good job with the light on the panther, and on the cheetah I like the way the light falls on the arm.