Hi,
I don't take nature photographs very much so I'd not comment on the second photograph.
On the first, it's a nice image, but very underexposed, by at least 1 stop I'd estimate. I know you have to work with what's in front of you for the most part but this image would be better if there had been some way to remove the tree in the centre foreground, either by physically bending it out of the way for the shot or by moving to a different location. On that front, I'm not overly certain that any of the trees in the foreground add to the image at all.
Steve