I noticed that there are some of galleries are mistagged, so I draw a line which I can clearly describe which penis types would use it better. This drawing below indicates that this red and green lines noted that these are retracted foreskin, orange is true circumcised penis. if any of three lines aren't listed would be quite questionable. (or folds in penis, also two tones that has sharp line which are separated, not gradual colour that indicate that it's grower uncut penis)
https://media.discordapp.net/attachments/390452161479311360/526250686367662120/unknown.png
I've been told by knotty curls to post it here on forums after having DM'ed them in discord.
Updated