tilt your camera down a little in those two images, to get in less sky, it makes for a better photo. You don't need ND filters for still shots, for the most part, just for video when the need arises. In still shots you almost never want to have the horizon right in the centre of the frame.
Thanks for the tips. For the first time, I had the ND16 on for both video and pics. Won't bore anyone with the video, as it was nothing exciting to see haha.
I have a summer trip coming up to Iceland, so I'd like to get good enough to make decent use of it there (where allowed) as the scenery is amazing. Also will be taking it with me to Aruba this summer as well.