What a great smile!
The great thing about amateur bondage photos is that the models ARE amateurs -- and they have not learned the standard poses and expressions that pro models wear almost like all that clothing they're not wearing.
Here we have an amateur model in a very nice pose with a great smile. I'm pretty sure she likes the photographer a lot. If the pose had a name it would be, "OK, now you've got me all tied up, stop fiddling with those ropes and just do me!"
Even the most sophisticated model in the raunchiest pose can't match that kind of natural, wholesome lust.