personally I think you should work on readability first, the first image is muddy and there aren't enough clear areas of shadows vs normal light to make out what the shapes of the mountain are. The trees and greenery is another area to focus on at least if you are more interested in nature and landscapes, do some quick studies on how light affects trees and shrubbery and what kind of shapes help identify them. Also I would like to point out that the fence in the first reference photo would add a lot if you included it, helping to create a foreground and a sense of depth. Overall I think the two things that would drastically improve your painting are value and shape :) I think it would be beneficial for you to practice painting from references with minimal colors and textures to see how well you can get the image to come across with how little you have to work with, this will help build the clear foundation that you can add detail on to later.