First thing, is you need to make sure your horizon is level. For me, waves are a bit like sunsets, they need some supporting element to do them justice. Just like pretty colours don't make a good sunset picture, a crashing wave doesn't make a good wave picture on its own. It's all about finding a good composition. With waves, you need another strong subject, traditionally, that could be a high cliff, a pier or a coastal house or similar. However, it could also work if you zoom in to a rockface to make the wave dominate more. Also, photography is all about getting the lighting and exposure right. For some scenes, that may actually mean underexposure, particularly if the scene is shot at dusk, but the wave does need to stand out. For me, the compositions don't work, as they lack a strong focal point and I would play around with increasing the exposure at least by a full stop to see if the waves stand out more. That will give you some ideas for next time. On the plus side, you have captured the motion of the waves well and thre is a real sense of movement and at least some drama, you just need to find some way to enhance that drama with a stronger composition and better lighting/exposure.