They look good! If you want to improve them, I think your best bet is to wait for better light. It looks duskish, or very cloudy in these photos, but if you get a low sun shining through, it'll add contrast and clarity to the waves and splashes, and possibly nice colours as well. Keep trying the location in different light to get a feel for what works best.
Also, it may help to add something to the foreground (ie, a person in the frame - don't let them get too close to the waves though!) to give a sense of scale. Waves and rocks can greatly vary in size, and without something in your frame for size reference, it's sometimes hard to tell whether the wave is big or small.
Just some thoughts from my years shooting beaches and ocean in Newfoundland.