I use photoshop in my line of work and do retouching. Some things seem odd to me. The light source is coming in from the top right, as the shadow falls over the left of da Judge's face. However, if you look at the second bottle from the left, it seems that the shadow is falling over the right side of the bottle, with the highlight on the left. It does look a little odd when you look at his pose. The hands are a bit wrong. The light source comes in from the right, and the right hand shouldn't be so 'bleached out', as it would be hit by the shadow from the column/curtain on the right. Da Judge was a big fat man, so I think he should be sitting higher up in his chair, and impose slightly over his desk. The right hand seems somehow twisted, and is a bit too far to the right. Any discrepancies on paper grain are inconclusive.
Having said all that, the image is of such poor quality, it's very difficult to tell. It's 50-50 whether it's a fake or not. Don't rule it out.
I could make a much better forgery than this. Anyone wanna send me some pics?