“Entusiasmo” is an Italian musical term meaning “with enthusiasm, brisk”.
I could just as easily named it enthusiasm, but in music entusiasmo means to swell up and out from your inner being. I believe an escalation from within is a much better description of the painting.

This painting is incredibly rich in color and full of excitement while maintaining its calming presence.

The color in the evening sky can sometimes simply overwhelm me with awe.