I like to promote doing searches in SSV.
Many questions and subjects have been addressed in the past.
If you want additional information or just curious...
there is a search panel in each section of SSV.
I have no answer for you except 'search' in General Scroll Sawing for "selling portraits"
selling scrollwork, selling, how to sell my stuff.
Oh, and if you find an answer, let me know please.
Larry