At first, I want to say that you used the colours very good. The different colours of blue make it look more realistic. I also like the fact that the colours get lighter at the place where the wave curls. The top of the wave is also well done. The lighter dots, make it more realistic as if there is a sort of shimmering. But as this is a critique there are also a few things I think that can be improved. The transition from the wave to the air, that can be seen at the left top corner, is not that clear. If the colours of the sky would be darker, you would get a better contrast between the wave and the sky. There is also a bit of orange something in the see. It looks like a fish so it has a funny side on it, but the bad side on it is that it totally distracts me. When I look at the painting, all my attention goes towards the orange thingy. This can be a trick you used, but if you did it on purpose I don't think it fits the painting.
So, this was it, quite a list, but I love the painting. The nice thing is that I'm better in criticising than making paintings so I have a lot of respect for you!
This is an absolutely gorgeous piece of art so great job! Before I clicked on the art to see a bigger copy, I actually thought it was a photograph of a real wave. I love the blending of the blues as well as the different coloration of blues you chose to use. The white on the top of the wave looks exactly like the mist you would see on a real one.
I can clearly see your vision in this piece and although this isn't an "original" idea as so many people choose wave art, I think you did a spectacular job at adding your twist to it.
The only thing I might suggest taking a second look at is the upper left corner where the yellow and purple come in. It was a bit distracting at first as I tried to understand what it was. I thought it was probably a cloud or something.