Jeod, I noticed a color error at the surf. On the beach part you could argue it is mad by the water, but on the water part the water was off also. I've fixed it. Oh yes, I've also calculated the height your screen should have 208 is a multiple of 16. So it is off by 3 pixels.
LTGH those two screens look nice, but as I've said before. I think the gap should be the size of the width of the house. I also noticed you having the same color error at the surf as I had. For the corner pieces have you looked at the desert in ALttP. If your worried about the top you might want to recolor a grass version of a blocking edge. The palm trees next to the house misses the banane trees also. Maybe I should make my cliff lower, but yours has to be a bit higher than all the other cliffs on the beach.