Nah,no where near that size.7.5x6 3/4 is way to big for that guy.Imagine Shane diesel is around 8x7,so that guy would be very close to shane's size , which is not.
He's very lean and the chick does not have big hands obviously.Huge tricks.A guy with a average size penis,let's say 6x5 would look pretty big if he has no fatpad.Now imagine a chick with tiny hands ( or average female hands ) around that dick.Ofc is going to look big.
Depending on the mouth.I heard people say that they had trouble at oral sex and they were like 5.5" in girth.Generally i would say from 6"+ oral sex is going to become uncomfortable for the chick.Just try to put something thick in your mouth,your cheek's muscle will get tierd ( your whole facial / mouth muscle will get tierd ) .
Look at some scenes with actors over 6" in girth( or 6") [ Shane Diesel,Mandingo,Jack Napier,etc) you can see the chick struggling to suck that dick.It doesn't look very comfortable for either of them.
I think 6" in girth could work unless she has big teeths.If she has big teeths ( and by big i mean long ) she's gonna scratch your dick.Oral sex could work with 6" or above that,but is not going to be comfortable for either of you,unless she was a huge mouth.