Any criticism for improvement on my photos?
Just a couple of thoughts......
On #1, there is a fair amount of haloing along her right shoulder and arm. It doesn't always have to be, but if she had her eyes follow her nose a bit more, we would be able to see white on each side of the iris, which is prefered in most portrait circles. I am of the mind that a cropped head is NOT a bad thing, just make sure that it doesn't look like a mistake of bad framing. I would be more aggressive with it. Take notice of minor details, such as the feather in her earrings should have a similar look / fall.
On #2, I would have her standing another 25-50 meters in front of the boats so that they are more distinguisable as boats, yet blurred. As is, the background is too busy or rather, too distracting IMO.
All said and done, these are nice images.