Not bad shots looks like it was a nice vacation. Problem - the horizon is right in the middle in the first two - not usually where you want to put it - it is much more effective to place it in the upper or lower third of the frame - upper third gives emphasis to the water and the shoreline - lower third gives emphasis to the sky - middle placement tells the viewer that you can't decide which is more important the shoreline or the sky, this position creates an unsettled compositional feeling - look up "rule of thirds" if you haven't heard about it. I would also clone out those birds in the first one, but that is just my personal preference.
In the first one, the shoreline in the foreground is a little dark. You may be able to lighten it up a bit depending on the editing program you are working with.
The third is good for me - nice composition and reflection - good shoreline placement...
Others may have additional comments...my 0.02¢ worth for now.
Cheers,
WesternGuy