Here is a rule that comes in handy when painting reflections on the water. Light objects reflect darker and dark objects make a reflection that is lighter. As you can see from this photo, the white boat casts a darker reflection in the water and the dark motor reflects lighter in the water. Don't ask me why but its always that way.
I have made an 11 minute video on the subject of waves and water. Click here
You can see a list of my other videos HERE.