I understand the hesitation if it has to do with privacy. This site is open to the public, so anyone with Internet access can see your profile, and your pictures. To see what I mean, just log out of the site (or use incognito mode), and try to visit your profile page. Everything is there.
Given that there is very little privacy on this site, would you feel more comfortable putting up a photo if there were privacy restrictions on it? Meaning, your photos are hidden/blurred by default. If someone wants to see them, they have to request permission from you, and you can grant access to that person, and that person only.
I'm pretty sure this site won't implement such a feature, but I'm curious to know if this type of feature is what users of a site like this would want.