They're not amazing to be honest, here are a few criticisms:
-The guy is lying down on his board, not actually surfing (not your fault, but it certainly would have made the shots more interesting)
-They all look a touch underexposed
-The subject is a bit small. this can be fixed by a crop or with a longer lens
-The subject is soft or out of focus in all the shots. Better focusing technique or better glass is the key here.
-The scene is rather dull in terms of colour, which again, you can't really help. In this case it may have been useful to include some sky and/or beach in at least one or two of the shots, or get in tighter on the subject to avoid the dull monotone look or the sea as much as possible.
Thanks for posting. Get out and give it another go if possible.