Chaotic Treescape #9

Generates realistic looking trees from a chaotic fractal
Based on my dweet here - https://www.dwitter.net/d/24167

Unlike IFS fractals which are designed to draw a certain shape, this particular fractal happens to generate these forms serendipitiously - which is quite a wonder.

The fractal itself needs only a few lines of code to generate.

Random colored skies and clouds are drawn, as well as moon an stars for the night-mode variations.
The image is rendered incrementally and takes about 10 seconds to generate.

Features available:

Time: Day/Night/Dusk
Sky: Clear/Cloudy/Overcast
Season: Spring/Summer/Fall
Tree shape: Bent/Straight/Scrubby
Tree spread: large/small