Warming up (no, really!)

The Illustration Friday prompt a few weeks ago was "burning"... right at the same time a particular tree at the end of my street exploded in a sort of flaming color not unlike the palette used in these illustrations.  Unfortunately, not only did I miss the deadline for the IF prompt, but I came home from work last week to discover that every last leaf had fallen from that tree.  So this post is dedicated to the swift passage of time.

So what do you think?  White outlines or no?