Upload & Sell: Off
I probably would play with the tones a bit, but it's not the peninsula alone that seems uneven. You have a big, dark circular area in the sky that overlaps the peninsula, much like you get with the use of a CPL. The effect is one of reverse vignetting (brighter corners). The other area you might work on a bit is the very bright patch of water on the left margin, which draws a lot of attention and does not help to keep the eye in the frame (a problem compounded by the leading lines of the foreground rocks, which direct the eye to that bright patch). Otherwise a beautiful scene.