It's pretty good. A few things need fixing up though:
-The yellow field needs to be removed or faed to the left (Better)
OR
-Take the effects off that cross into the field, it looks really off. (If you don't like the suggestion above)
-The brightness around your stock is alright, but maybe a bit too bright.
I do like the effects around the stock, maybe move the stock over to the right a tad bit? Also, the effects going from left to right look pretty good if you were to fix the field portion of it. I think the lighting and clouds are good, just for some reason in the center it goes from light blue to light purple, it looks a bit choppy, try and smooth it out. Definitely have a sig with much potential.