'.Run Free.'

The first thing I noticed here was your use of some sort of Photoshop brush for those clouds. It's possible that I am wrong, and I apologize if I am, but they just look ridiculously realistic and detailed compared to poor Jonesy in the foreground there.

He has no fur, no wrinkles in his skin, no muscular definition in the shadows and has very general, non-specific shading in general. Similarly, the grass seems to have been created hastily and has almost no detail in it.

This means the highly detailed clouds look extremely out of place, especially when you consider that they are waaaaaaay in the background. They are thousands- nay, tens of thousands of feet above Jonesy and the ground. So it looks very strange that we see them in more detail than we see him. Generally, objects further away from the viewer are less clear and less detailed than things that are closer (as you'd expect. People that are far away from you are more difficult to see or recognize, yes?). Also, as a bit of food for thought, objects farther away are also closer to the general background/atmospheric color of the image overall. But this is not important here.

The clouds are what struck me most. They should be less detailed so they are less distracting. Furthermore, you should try getting some reference from animals you think Jonesy would look like if he was real and try and push your level of detail in him and the grass he's running on. For example, he sort of looks like he's floating. There's no evidence that he's ever touched the ground and, without the description of him and what he's doing, we wouldn't know that he was running and not... I don't know, landing after flying magically somehow or something. X3 He should be stirring up a little bit of dirt or dust or, better yet, some blades of grass being kicked up by his paws as they contact the ground.

Similarly, his mane is very stiff. Hair tends to be very random and flowy, but you have drawn it in a very solid manner. I suggest some tutorials:

[link] [link] [link] [link]

You may choose which one suits your style best. But, overall, I suggest pushing yourself a little bit more. Granted, anatomy and the overall image and conceptual design and basis is more important than any details, but they can be a nice add on.

So, overall, I say:
- Investigate some photographic reference to get a better idea of this character's anatomy (both proportional and when it comes to details like his musculature and fur texture/length)
- Also try using photographic ref for backgrounds
- Try to incorporate more interesting details in areas of importance such as the hair and overall foreground in general, to draw attention to it
- Try to lessen details in the background, such as the clouds and shadows there