Looking for opinions.
The following reviews offer examples (all sizes are in pixels) ~
< 240 x 320:
Antipova's Hardware coupling hex nuts review
240 x 320:
Pleasure Piratess' Conqueror Review (this review has multiple sizes, but there are two instances of 240 x 320)
375 x 500:
P'Gell's Triple orgasm french kiss review (mostly horizontal)
My Tentacle review (mostly vertical, a few are slightly smaller than 375 x 500)
Variable length, fixed width of 600:
Vaccinium's Luvin lamb - white review (the vertical picture at the bottom is 600 x 400)
Variable length, fixed width of 640:
Miss Nessa's Lockable sex toy case review
If you come across more examples, please link them in the comments.
The following reviews offer examples (all sizes are in pixels) ~
< 240 x 320:
Antipova's Hardware coupling hex nuts review
240 x 320:
Pleasure Piratess' Conqueror Review (this review has multiple sizes, but there are two instances of 240 x 320)
375 x 500:
P'Gell's Triple orgasm french kiss review (mostly horizontal)
My Tentacle review (mostly vertical, a few are slightly smaller than 375 x 500)
Variable length, fixed width of 600:
Vaccinium's Luvin lamb - white review (the vertical picture at the bottom is 600 x 400)
Variable length, fixed width of 640:
Miss Nessa's Lockable sex toy case review
If you come across more examples, please link them in the comments.