Painting foliage in gouache – series of 4

Here are the studies together, all done with the same set of hues – Lemon yellow, cad red, Quinacridone rose, Pthalo blue, Burnt sienna, raw umber + Permanent white. Though I wanted to try variations in
1.saturation levels,
2.value patterns,
they all ended up with same value pattern and still need to work on getting a control in saturation of greens. But these studies helped me with other aspects like rendering and edge control!
Any inputs?