Something's Wrong with this SC2 Artwork

I was browsing through the artwork section in Starcraft 2 official webpage and I came across this picture.

Tell me what’s wrong in the picture below



Still can’t notice it? Nevermind, I narrow down the search for you.



Still can’t figure it? C’mon, use some of your imaginations.

Giving up? Alright, scroll down for the answer

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.



THAT FREAKING PENIS-LOOKS-A-LIKE ROCK IN THE BACKGROUND IS HAVING AN ERECTION!!! ZOMGWTFBBQSAUCE!!!!!