The first shot has the makings of a good one, a couple of things that jump out at me
are the colour and maybe a slightly different framing, it looks quite blue and a little over
saturated I would pull back on the colour saturation a bit and re-crop taking off a little of
the foreground water and a tad off the left side so that the island is slightly off centre.
The second needs a bit of a contrast boost as it looks more tones of grey than black and white,
again the island is a little bit central.
The third is a lovely composition, tone down the blue just a little bit.
if you think it’s that easy, wait to hear my “complains” too, it’s more to take on board :)
to me is very visible on #1 & #3 that the sky is overexposed. so few brush strokes or and nd filter in photoshop might sort that out.