Looks really nice, I think. I mean, I don't have too much room to talk because I could never do anything that lovely. I think the rocks look nice, however they could have been blended a bit more (by his/her paws) to make it look a little less like they're just lines in photoshop. I also agree with *whitewolf16 about the shading -- it's a bit off. Finally, his/her legs... it's hard to tell there is two of them there without the dark brown "sock" marking on the leg. There isn't a line or anything to show the outline of the leg in front. I think if you fixed that, it would look a bit better. But otherwise, I think this turned out really nice. Good work... I look forward to seeing more of your comic. :]

Overall, this is beautiful. The colours blend well and the character fits well into the background.
I'd suggest practicing rocks on their own and with various grass etc. around them to perfect your style, you used Katikut's tutorial for this? ^^'
It looks like it, anyway, the rock Kaisyn is laying on looks harsher than the one with his shadow on it, the one he's on has visible thin strokes on it, looking a bit more detailed whilst the others are softer and don't have the thin lines on them.

The only other thing is his shadow is the wrong perspective(?). His ears are facing forward toward the reader and his shading indicates the light source is to the right of the panel which means the ears in his shadow should be side-on and not also forwards. The cheek fluff in the shadow should also not be there at that angle, it should be the top of his muzzle and then the top of his leg.

You also didn't add a shine on his eyes, without it they look flat and matte whereas they're actually curved and shiny/glossy.

It really does look beautiful though, I love the colours and his pose. He also looks way better without those green marks. ;D