I also generally leave as is.
I mean, these bamboo trees in the background would look better if I painted their trunks brown, but the "juice isn't worth the squeeze" in my case
sometimes though, I'll do a light wash in parts. Like the vibrant green plants here with agrax earthshade dropped in the middle regions of the leaves. just to break up the deep green.
but yeah, often times the plants look fine as is.