Day One: blocking in the basic composition & values.
Day 2: begins with blocking in the tree.
Day 2.1: After the tree, it is back to the arch and canyon walls.
Day 3: more sandstone work.
Day 3.5, 4 & 5: back into the tree, then sky, then sandstone.
When I came across this tree growing under the arch, I was dazzled by the spacial relationships and color contrast and ideas of deep time in the long life of the tree growing below the time-carved archway. Still blocking in areas, and much of the tree is yet to be created, but the basics of atmosphere and spacial color relationships/contrasts is set enough for a few in-progress pictures. 
DangerHart 