Cowboy

I am going to agree with Mike on most points.
The lips didn't bother me.
I believe the light is so low to get light under the brim of the hat to light the eyes, right?
The ratios are good, just the right amount of fill.

I am going to add that the expression is really good. 

I know backgrounds are a pain to change in Photoshop, and are hard to make look realistic.  I am glad Mike pointed out that the sharpness was wrong, I couldn't put my finger on what the problem was, although my brain was telling me something was off.  For this shot not much of the background is showing so you could have gotten away with a piece of brown fabric far enough in the distance to be out of focus. 

I know opinions do not exactly belong here, but I am going to share mine anyway bear with me. 
Marian, you are getting a lot better with your photography, I think it may be time to invest in some backgrounds, I know you can get wallpaper that looks just like real bricks, you would probably use it a ton if you could figure out a way to wallpaper an area in your studio or a large board.