You're still learning, so I won't be critical.
First of all, I really like the grass. Is it a brush you found or did you make it yourself? And the shadows you did are superb! Your lines are very clean and the coloring is very tidy. The metallic effects are also very, very nice.
Now, although this is good, I have to say that it's very empty. The subject matter doesn't take up enough space and leaves the background and foreground very void. It needs more substance. Try adding some shrubs, trees, even flowers would make it less plain(no pun intended). And, when I look at the panther, the tail has a shadow directly connected to it. That makes that area of the picture very flat compared to other spaces. I would suggest moving the tail's shadow an inch or 2 to the right then 2 inches down. It will help give the picture some dimension. Eddie's head looks slightly slanted, but that's easy to fix. I'm not sure if you want Eddie's proportions to be realistic, but in case you don't, I feel it adds to the cartoony vibe I get.
Very well done! I hope to see more from you in the future.