Really like #2. The colors are beautiful, they're subtle and very natural looking. Also like the silhouette of the boats. Was this photo tweaked or enhanced in any way? The 3rd photo I feel needs some work. The colors are a bit bland and could use some tweaking. all in all good start!
Horizon is tilted on the first 2. #2 is the most interesting to me, but without a clear singular subject, it keeps me wandering with no good place to lockon.
I'm too new to give any advice, but I really like #2 for the reason given above, it's interesting all the boats are perfectly lined up on the horizon, but there is one that's different from the others. #3 seems kind of bland/ordinary to me.