ohhh i like your fence posts! really leads the eye into, and along, the painting! My only suggestion would be, maybe starting right above the lovely streak of yellow on the left hand side, having lighter values as you recede into the painting? Same for the left hand side of the trees in the middle distance. Generally speaking, you want your strongest values in the foreground and lighter in the background. A really helpful trick I've found is to take a photo of your finished painting. Then edit it to pure black and white. This makes it much clearer to see your values and where they need to be adjusted in order to not appear flat or all the same. Doing value studies beforehand can help prevent this too, but I'm guilty of not always doing that too because sometimes I just want to paint! :D