I somewhat reject the concept or term "Curb Appeal" as it infers ONLY from the street. I feel it is "antiquated" from a time when listings were "one page in a book" or at least a maximum of three or four grainy pictures. I think with the modern MLS (Zillow, et al) buyers are more cognizant that the "cover" does not always represent the book. I feel strongly you should just "stuff it in" Quality, Condition, Design, and explain.... like it or not FNMA wants it stuffed in those boxes; and it's not that hard once you decide on "metrics" in your head (amount of brick, number of corners, trim detail, whatever you use for your metrics.
NOW I throw in the "BS" term I use (but do not adjust per say) for higher end custom homes. "Overall Execution", although I still "stuff it in the boxes" I use this as a metric when selecting comps. making sure the subject is represented. If your one of the top in your market your going to get to the upper end of this. My foundation is likely different, having built almost exclusively custom homes as the craftsman in my 20's and higher end commercial until I was an appraiser, and try to visit all the high end homes (open houses) I can. My Son is currently managing several 20 - 25 million dollar builds on Lake Tahoe, so I go out there to see the nth degree in design and material (newsflash the material and craftsmanship is not really much better than the $1.5 - $3M homes, it's simply the LOCATION and "overall execution". It can still be "stuffed in" the XML form boxes for our Robot Overlords!
Bob in CO