One thing I've noticed from progress pictures posted here is how 2 very similar sizes (based on stats) look drastically different based on the size of the glans.

Essentially...smaller glans makes you look much bigger.

For example, let's take 2 guys, both ~6x5

Guy 1: small, narrow glans (e.g. 1 inch long, 1.2 inch diameter), would leave a shaft 5 inches long and looking much thicker at 1.6 inch diameter.

Guy 2: large, thick glans (e.g. 2 inches long, 1.8 inch diameter) would leave a 4 inch shaft that looks thinner than the head.

The visual effect is that guy 2 looks a lot bigger because there is more shaft and that shaft looks much thicker in a relative sense.

I fall into the latter bucket, and often see pictures from guys with similar stats and think they look far, far larger.

Anyway, just starting a discussion on this one...

And didn't want to re-use pictures to illustrate without permission, so if you're open to a side by side measured picture comparison to test this theory let me know!