Face Pull? It's always interesting to learn something new and I just did. The picture looks like that exercise would affect the laterial delts and traps. And posterior delts to a lesser degree, as more of a stablization factor. Like the BB/DB upright rows do. With the elbows raised a little higher than shoulder level, the traps would take over the brunt of the work rather than the laterial/posterior delts.
If the subject is more focus on the rear delts than the pec deck, with the elbows in line with the shoulders or a little higher, is excellent. The point of resistence is on the elbows, which makes the movement very effective. Better leverage and affect than the DB bentover rear delt raise. Might also try bentover DB rows, one arm at a time. Lead with the elbow and keep the lift arched out and wide, away from the body. Same with a BB, using a wider grip and pulling to the top part of the chest or even inline with the shoulders( prefered). Weither DB or BB the arm should form a 90 degree angle at the top part of the exercise. For me anyway (and a few of my Bud's), chins behind the neck give good results as far of rear delt development goes. Good Luck.
