You should have just asked on your previous post that has so much engagement. Adding trim means removing the siding so the trim can be properly flashed, you’ve indicated you don’t want remove siding. Adding trim on top is a recipe for water intrusion.

" Adding trim on top is a recipe for water intrusion. "

And look like what it is lick and stick, pasted on trim.

What this facade really needs is windows in those gables instead of the tiny vents. Double hung windows the same proportion of the second floor windows but roughly 2/3rd the size.