Pics with perspective of 28mm brushes, anyone?

Hey, does anyone here happen to have pics of what a 28mm brush looks like vs a human head? I found some old handles but they're all 28mm diameter, so I'll only be able to use those for 28mm brushes. That's ok, but I wonder how HUGE that really is. Without any reference in real life and all brushes looking the same on a picture, it is quite difficult. So if someone happens to have any pics that show the size (not brushes next to eachother, because that agin is not clear to me) vs your (anyone's) face or something, would be nice.

Thanks!