Hi Julia,
You what annoying people say when you are painting a wall or window frame?
That's right; "You missed a bit"
(look at the top, just right of centre)
sorry, I couldn't resist
Other than that, it is a pretty good job, the more you do it, the more you learn how to disguise it; practice makes perfect, as they say.
I don't think so, not unless the photo is supposed to be making a point about birds killed by flying into power lines.
It looks a bit dim, although I guess twilight, it might be worth giving a bit more exposure.
Hope that helps,