Nice

Love the color, love the depth. The waves are a bit lacking. The overall effect is slightly dull. The sea foam is draw quite well. The clouds are nothing short of stormy. The rocks and their reflections are done well. However, the reflections on the water persist, despite the fact there is no sun. But the finish look is quite balanced. Good.

Photoshop or picture scan?

Cause if this was done by hand on paper that's mighty impressive.