Expanding the Imagination
It is commonly known that repetition gives artists the ability to control what they create with more accuracy. For example, repetition helps dancers control their form, singers, cooks, painters, musicians, etc. generally get better at controlling their process from repetition.
As for the role of the imagination in art, it’s important to notice that non-repetitive decisions are what make art more unique and surprising. So while repetition helps to achieve more consistent results, it can also prevent the imagination from exploring newer ideas during a creative process.  
With first priority given to freedom of expression, whether the artist prefers to make more similar art or more unique experiments from one piece to the next, the hypothesis below helps artists decondition their process to produce more diverse styles.
“By paying attention to patterns in decisions during an original creation, this may help artists with divergent thinking during their process.”
 "Expertise as Mental Set: The Effects of Domain Knowledge in Creative Problem Solving" Michael Öllinger1, Gary Jones2 and Günther Knoblich3. 1 Vol. 55: , Issue. 4, : Pages. 269-282
(Issue publication date: January 2008)
 The Brain That Changes Itself (Pg. 7) Norman Doidge M.D. Viking Press 2007