I agree with you on the first image. I think the foreground could be brighter and also you might try cropping in so as to loose a bit of the foreground and some the empty sky on top. Give it a go and see how it looks. As for the second image, I think he mid is bright enough but again I would crop most of he grass in front and the sky above. The colours behind the large tree are amazing and the mist in the trees to the left is great as well. I just think those details are getting a bit lost with so much empty space above and below. Repost if you make any changes, I’d be interested to see how they turn out.