Advantageously placed for a glamour photograph? (7,6)
I believe the answer is:
sitting pretty
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for sitting pretty that I've seen before include "In an enviable position" , "Might supermodel be" , "Enjoying an advantageous position" , "acting and looking like model?" , "In a good situation" .)