Forget about the undersized shutters for now...this detail would look better if the support above the window matched the condition below. It was obviously just stuck on for the dreaded "curb appeal"...sorry, it's just not very convincing. If the opening (a window in this case) is rectilinear, then the the supporting detail above should be follow that shape. I get it...arched windows weren't in the budget...trying to fake the arched appearance just makes it look worse.
