Me, the girl from a tropical country, right, so what did I know about their trees? Carolyn pointed out the leaves to me - oak, hickory, maple. So this is for you, Carolyn.
By now, layering colors is the norm for me. No other way to achieve depth and realism. I did the oak leaves still with a tinge of green in their spines. Each leaf had four colors in it - mid brown, deep brown, Lincoln green and that lovely color, pimento.
The strong greens: am not sure if that's ivy or not, but now, looking back, i think the green is too raw.
After a while, this drawing was starting to test my endurance, so I pretty much finished it to get it over and done with. Maybe there's too much brown in it. This is, after all, green man, right? I didn't want to add more brown by coloring the woody branches in that shade, so I used my Derwent grey green (and a couple of brownish shades) instead, which I think has hewed the color palette for the piece back to the green side.