It would be helpful to not type the entire text of your message into the subject line, as it gets cut off.
If by brush effect you mean the red areas, that is due to having highlight clipping turned on at the right of the histogram. Click again, and it'll turn off. You also have shadow clipping (pur black) warning turned on at the top-left of the histogram that would show up blue so turn that off, too, unless it's on intentionally.
If you mean something else by paint-brush effect then please describe more specifically what you mean.
Thats was it. Thanks for help. And yes I see your point about subject windw typing.