Is it OK to post photo manipulations here

Yea, the main focus of these forums is to help people with issues with their applications. They can post examples if they want or need help achieving a desired outcome. There are so many critique sites. It is nice to see what people are doing, as apposed to all the questions about PS crashing. @pete.green is in charge of the digital imaging forums, so it would be his decision to add a space for critique area.

Ged, great concept art. If I may I'd put his lower legs over the frame so he look like he's emerging from it. Out of bounds type!

Why composite? The weirdest things come together if you look for them. These are straight out of the camera:

I second the request to have a location for people to share their work and learn by critique, both, about how well the work was accomplished - but more-so about learning efficient, powerful, non-destructive techniques to accomplish their wishes. I'm going to post that particular request in the lounge (or look to see if anyone else has)!

I rather like this composite. It is reminiscent of an Alice in Wonderland world with shades of a Clockwork Orange and is imaginative. You might like to apply a B/W adjustment layer as a few of the elements don't quite blend properly and this shows up much more clearly with a temporary B/W layer. The masking is clean , the bricks are a little weird as they are gigantic at the back and top but half as small at the sides, but in a surreal world I'm not sure that really matters.

Personally I like to see what people achieve here, you can post on Behance but that's not for critique and this sort of thing stimulates dialog. 

And not knowing how accomplished a Photoshop user you are I’d like to add a question on the point of technique (which I think is usually more the focus of attention here):

Did you employ a prudently non-destructive approach and utilise Smart Objects (for all the individual picture-elements) and Adjustment Layers?

I don’t think comments/advice on images is the primary focus of this Forum but I don’t think it’s wholly illegitimate if one is prepared to accept the commentary.

In this case I would recommend that you pay additional attention to the

• the »entry-points« of the chain in the ceiling

• the shadows of the sitting person and the bovine

Also I think the »brick-cuboid«-image itself is not ideal as it seems to feature noticeable repetition.