work with the depressed grad student who is good at stats to determine the parameters of your experiment at the outset and calculate the number of subjects and stimuli for statistical power; pay in marking or research help.
get an appropriate number of headshots from undergrad males for stimuli, give them intro psyc course credit for participating.
work with mid-degree graphic design students to give all headshots 3 levels of chins (low, normal, emphasized), ensuring none are comical; the the psyc grad student signs off on the work as portfolio credit
have an appropriate number of undergrad cis-het women subjects rate a your lineup for attractiveness; intro psyc course credit for participation
analyze the results to see if low chin is selected less than normal or emphasized.
submit your research paper and results; get your 4th year class capstone. Grad student takes your work and adds it to their dissertation, you get a footnote.
I completely missed the "with" in your first sentence and, wow, I had some thoughts and feelings which I am glad I didn't share without re-reading what you wrote first.
Well, thank you for your reasonable response. Have you seen Parks and Rec though? Because your response kind of sounds like it's continuing the joke...
This is, like, an undergrad project.
I'm sure this has been done...