The grass does look a bit messy, but I'm sure you'll get the hang of it soon. Still, the overall atmosphere of the wall is really energetic and the sky and sea BG is a nice touch that goes well with it. Nice wall. Keep up the good work.

Great vector, =D but I have a few concerns.

The background confuses me a bit. It's clearly a nice sunny day, with the ocean and all, but why does it cut off and go into a galaxy kinda of sky? It's strange to me.

I think your grassy hill was clever, with how you made the grass go upside and in another angles, though the grass itself is flat and it repeats the same pattern over and over. As you can see, the grass just ends, like it's floating there out of nowhere. Using PS' default grass brush is usually not the best way to go about making grass in a scene.

I also feel like the water is too realistic for your vector, containing too many details compared to the vector it puts the wall off balance a bit, you know? I think it would look better without that large text as well. @~1@

Sorry for my rather long rant.