That reminds me, I never discussed underwater terrain.
Normally what'll happen with beaches is that they'll slope down into the water at that light angle, then reach a flat area, then drop elevation like a cliff. That's pretty far out to sea though, so using this following picture as a guide is probably more ideal.
On your terrain, Kade, I'll give it a 40/50. I can definitely see a personal style, the use of "largescale" terrain punctuated by small details, with a preference for flat levels. I'd do some work on defining beaches or sides of the island; right now it looks like you just set water to intersect a small hilll.