It looks ok I guess, but also the filters give it a kind of a blurry feel, I don't really know what are mountains and what are forests, grass and desert areas...there's just not that much of a difference for me, I can tell where the beach is but that's about it.
Also (since I can't tell what are the mountains) on what scale is this supposed to be?
There's something to creating fantasy lands, but even in those geology usually works the same. Islands usually have a hill in the middle or a dominant mountain, since that's what islands are, mountains where the meadows are under the sea. Some sides may have cliffs and not sandy beaches. Also, maybe a river or two.