From looking at the image, I'd say the penis was pumped just prior to the photo being taken.
There are several signs to look for, most of which are noticable in the image. It appears that he pumped for long enough time straight, a couple hours or more and pulled "liqued fatty tissue" into his penis, thus making it thicker. The penis appears at one place to be on the verge of having a "pump blister".
Pump blisters takes days or a couple weeks to heal. I do not recommend over pumping, using to much pressure and or for to long of a time period straight.
Rain...