23. Tap on the tree trunk to knock off any excess foam. At this point, if the tree looks too thick, keep tapping, not alot you can do about that, but it really hasn't been a problem except with the fine powdery type grass stuff. If the tree looks too thin, just spray on some more hair spray and add more leaf material.
The coarse foam generally doesn't stick as well as the finer stuff. I often have to give it another shot of hair spray and more leaves, sometimes even two or three more applications. Also, if there is just a specific spot or two that look thin, just spray that spot and add leaves right there.
Use the tap technique to get the tree looking how you want it.
Now, be careful with the really fine leave material, the stuff that is almost a pwder. It sticks really well and can overwhelm the tree if you put too much.
As for colors, sometimes we pre-mix several colors and textures and then sprinkle it on. Other times, we do a solid color, let that set, then spray the bottom of the tree and add some darker color, let that set, then add something lighter at the top for some depth and a little highlighting.
The leave material also comes in fall colors and you can throw a pinch in here and there for good measure. I am modeling late summer early fall, down here we have chineese tallow trees that start turning yellow and red pretty early.