Quickly defining greens

Over this long weekend, I've been quickly working on the midsection, in other words, focal point of this painting, mainly center toward left. I tried defining the colors of greens against the dried grass color. I also put some reddish soil colors in the background to see the effect of greens.

Then I realized those greens were a little too light. Since they are still wet (even though I used some oil painting medium), I can't put any darker colors on top of them. It would just mud them up. I need to wait a couple of days at least.