> I thought you had filled the "holes" with a dark color so we couldn't guess which plugs they were.

haha yes, I thought if I show a single real interface it's a rush to be the first to write the answer, lol

The next clue would have been the screws around the exhaust fan I guess

> Thanks this was fun.

Thanks for the feedback, it's also fun to think of good objects as pictures :)
I am also improving my photography and editing skills haha

Guess The Picture #3

Nice, to be sincere, after looking at it, this was the only thing that came to my mind. However, I thought you had filled the "holes" with a dark color so we couldn't guess which plugs they were. 

Looking at the original image, now I see that I was completely wrong :)
Thanks this was fun.