1 - Very nice map if it did not have the grid I could use it in my VTT game in about 2 minutes.
2 - The drop shadows are nice but I would actually make them a bit more dramatic to show the height of the wall ruins (more shadow, higher pile of stone)
3 - For a battle map it needs more space around everything. (I think this applies to almost all of them) Just extending out the edges and filling in with the random trees is a good thing. If the DM does not want the extra space he does not have to print them, or he can crop them out. But is is much easier to crop etc then to add more. Give the characters at least 100 feet of space from the focus of the map to the edge. These are not 8 by 10 sheets of paper, pixels can extend for a long ways
4 - A small bit in the corner with your name on it!
I do like this a lot, I would use it.