I actually like your painting here. You deserve better than a 5.9.
However, the stream bothers me. I've seen a lot of people do this and I'm going to finally take it out on you, sorry.
A stream that narrow, which is really quite narrow, would not be blue. Blue water only occurs when there is sufficient depth to reflect the blue of the sky. A stream that narrow would be shallow and, most likely, brown, allowing the mud beneath to show through.