Ok, so, heh, first critique ^w^ Anyways, I believe the lighting and total image is absolutely beautiful. I would suggest having some grass sprouts popping up around his paws and/or tail, to signal he's laying down Don't worry, I still need to work on that too, so it's optional Anyways, I'd suggest adding the other ear, perhaps flopping down on the paw, so it doesn't just look like he's lost it ^^ Finally, maybe add a bit more curve to the back, so it shows he's curled up. His body looks just a tad bit short.
Other than all that, I think this is a great picture! Keep up the good work :3