Hardy,
This dolphin is what we called tuimelaar, (Tursiops truncatus). This dolphin has a white belly and a grey top. The hole is a blowhole. But it is not a wale. Because he is not a wale he blows no wather out of the hole. I read that only wales blow water ( if it is not true i do it with permission).
So, i think (because this dolphin is a very social animal0 you paint another behind this one.
Looks wonderfull to me.
Marc