For me glamour would be lots of models wandering down catwalks in fancy dresses, or hundreds of portraits of beautiful men or women. All well and good, but they won't sell like that. Put them all in business clothes then you're talking.
On an aside, by some modern day miracle, Alamy sold a pic of mine for just over $1000 dollars today - it's my highest ever single sale for advertising, and was of a snowy mountain range.
Really, the oddest things sell...
Rgds
Oldhand