Your map is quite decent but it needs more life. It needs more plants and bushes since it's an island and many things can appear on it. I like the way you place the ruins pillars and the firepots. Oh and don't place any man-made tiles like the bricks under trees. It makes them look so unrealistic. You should also add some doodads (walkable though) at the empty spaces around since it looks pretty dull. Perhaps grass or something, your call.
All in all, it is decent but a few extra touch-ups will make this map look realistic, if that's what you're aiming for.