Very nice set, it’s hard to choose a favourite between the first three but I think I will go with the third shot. They certainly would look better if they were slightly bigger.
I like 2 and 4. The body position of the surfer in 2 has great dynamic tension in it. (or is he just about to fall over?) I like the colours in 4.
What lens were you using, and how close to the water were you? In general the breaking waves in the foreground are a distraction imo, and the white water from the previous wave takes from No4.