Hi Marc,
looks like your wife got to enjoy one spectacular sunset. I might boost the contrast just a hair to make it pop even more.........but that may be too much for some. The horizon may have a very slight lean to it & need a bit of CCW rotation and i would also consider cleaning up the LR corner dark blue to mach the lighter water........these are very easy and minor corrections.........I like your placement of the cabana's......even though they are not in a rule of thirds position.........they ground the image nicely IMO. I also looked at a pno crop of this..........just above the left god ray..........while I ike that also.........i like the original presentation just as much. Very nicely done and quite the birthday treat!