I don't think that has any scientific validity but it used to be a popular idea on Readers Digest.
You may be referring to the popular belief that the right hemisphere is associated with creativity. What I am referring is spatial relationships and how that might be connected to artistic composition.
From a paper on the Dana Foundation website, published in 2019:
"...for about 30 percent of lefties, the right hemisphere rules in these regards. The same is true for about 3 percent of right-handers. In another substantial minority, control of language seems more evenly distributed between the hemispheres. Functions in which the right hemisphere commonly predominates have taken longer to pin down, and are less marked than language dominance.
This side seems particularly important in spatial orientation—people with right brain injuries are prone to getting lost even in familiar surroundings, and may become unable to draw. ..."
From the NIH (2010):
"...The right hemisphere sees the whole, before whatever it is gets broken up into parts in our attempt to know it, and its holistic processing is not based on summation of parts. The right hemisphere, with its greater integrative power, is constantly searching for patterns in things, and its understanding is based on complex pattern recognition. On the other hand, the left hemisphere sees part-objects..."
"...For the same reason that the right hemisphere sees things as a whole, it also sees each thing in its context, as standing in a qualifying relationship with all that surrounds it..."