Arghhh! I am going backwards

My painting skills, what little there are of them, are going backwards. I can't seem to get anything figured out. My latest painting, which is an attempt at a rework of my last painting, is terrible. The colors are flat and lifeless and the perspective is better but still off. I started with a wash of the canvas in a thinned out burnt umber. Then I drew in the major details, especially the barn, and then started painting. I honestly don't know what I am doing wrong. I will have a lot of questions for the instructor of my painting class next week. I plan to keep working on the painting but at this point I don't think it is salvageable.