Balancing opposites

Balancing opposites - student project

Some of my photos can be such opposites! Brown, green, and blue seem to be common colors. I like the way the natural, bright and contrasting feeds look and would like to adopt that. I also have some softer dawn/dusk photos I am reluctant to edit too much because I'd hate to completely change their natural mood. 

This is the most uniform I've gotten so far by using only 1 or 2 presets from the Preview app. 

Any tips to help make it look more consistent? Should I space out the darker photos with more bright ones? Or group dark photos together and fade them by rows into groups of brighter photos?

Balancing opposites - image 1 - student projectBalancing opposites - image 2 - student project