Its drawn well but everything is the same shade of green. It needs some variety to make it better, Trees aren't one color, they have lots of color and ambient and relected light to give them lots of hue variety.
My goal is to preserve the greenery of the place. to give the preys a positive vibes on the place, but i know there are other ways to do it without sticking on just one basic set of colour. But i'm not aiming for realism for this work that's why i stick on the more ideal way to render the place. saw yorur works they are nice and good choices of colours. do you got references for those? it looks like it's almost a photograph but rendered artistically