Composition is very nice, especially the second one, I see a lot of landscapes where the photographer doesnt take the time to include lines and shapes in the composition and those two are quite nice.
As for improvement, I guess the weather was your challenge here, it got a bit hazy. Normally to combat haze you can use a skylight filter, I havent tried an actual physical skylight filter so I cant say how well they work, but I am including a "soft-skylight" example from photoshop, this one is a comercial one that also does a bit of warming but I am sure if you google for skylight you can find tutorials or free filters.
Not the biggest improvement. There are other PP techniques like HDR and Contrast Masking that could be tried too.
I didnt apply it to the whole image, to show before/after