This was all done with much laughter; and in the full knowledge that we were either tricking our brains to see what was there, or becoming so lost in our own pareidolia, that we couldn't see anything truly anymore.
You might be thinking by now, 'Forget the picture on the curtains! There's a man sitting in that chair!'
No, there's not. There's not even a chair. Look again. If you're struggling to see past the patterns produced by your brain, start at the top. Can you see the corner in the roof panels? Follow that down, until you grasp that the ghost's crotch and legs are created by the corner of the room. His enormous pelvic area is suggested by two walls meeting there.
It's exacerbated by the fact that those 'walls' are actually thin, painted panels of plasterboard. There's a rogue panel leaning up against walls of the same color, in that corner.
The 'chair' is suggested by the leg of a table on the right-hand side; and the background on whatever print is on that curtain, or window blinds, or picture to the left. Light is streaming through the window, turning more of that print into the ghost's chest.
Look closely at the head. It's too indistinct to call it completely, but it looks to me like a rag hanging from a hook. Or something else stacked there.
I believe in ghosts, but I also believe in pareidolia. This image, to my mind, is pure pareidolia and an excellent example of why ghost hunters need to watch out for it.