The entire landscape was created "en plein air", on my hands and knees from a 2nd story parking lot, in Walnut California, in view of Mount San Antonio.
The clouds were created from portions of 5 16x20 plein air paintings I had with me, and painted after the landscape was captured.
The Eucs were developed from photos of Eucalyptus groves around the area of Mount SAC, that I discovered. Personally, the EUC should be the California "State Tree".