Hi Jan,
Glad to see that you've enjoyed your holidays. It must have made a difference being under the warm sun for a while, away from the bad winter we are having in Northern Europe.
As a landscape photographer, you know all too well how important it is to be at the right spot at the right moment when the light is fantastic. Unfortunately, this is a luxury we cannot have while on vacation. We do not have the time to do a recon and to go back at a later time (a multitude of times in fact) to wait for the right opportunity. So we make do with what we can, meaning that the light is usually less than ideal. As it seems to be the case with these pictures. I think that they would benefit from a better light. Alas there was nothing you could do about it.
The horizon is a bit off on the boat picture it seems. In the last one, the foreground element (the bush) is, while adding an element of depth to the landscape, not interesting enough. Also, I'd consider cropping it a bit on the LHS. If you want to go to the extreme, you could crop from the LHS and the bottom part to get a panoramic format of the mountain mass, the beach and the clouds. Just an idea

.
Thanks for sharing,
Cheers,