Your seascape is vibrant Pamster - I like the way you've blended the blues, from the wispy cloudy sky down through the wavy sea, and you've captured the surf breaking on the shoreline. The beach is inviting - I like the colour you've used for the sand - it looks so natural.
Perhaps if you had more transition from the blue to white to sand color? You have a band of white and then a nearly solid band of blue. If you had more wispy white transitioning in that solid blue area it might give it more movement. You could try it out and then needle felt it if you liked it.
You’ve made a great picture Pamster and should be proud of it. I’m not sure I’d change anything but as you asked for suggestions...
You have a white section in front of the main wave which looks like the foam from a previous wave. You could add a little blue to that as the wet would probably pick up a bit of colour from the sky. That may give a bit more definition. You could also needle felt other bits of felt, locks & wool onto the wave.
If you want more definition in a wave on your next go you can really pile on locks, silk hankies, wool burrs and other bits & pieces. Even scraps of fabric, lace & ribbon. I find if you layer up silk hankies without too much wool on top you can pick at them with a broken needle felt needle when the picture is fulled & dry which makes the picture more 3D.