I wonder about this myself. Although I work with photoshop every day, high quality photo manipulation for the purpose of fooling the eye isn't my area of expertise. I think Hatuey would be better suited to say. What looks kind of odd to me is the darkened red outline of the poster against the mother's sleeve, like so:
View attachment 67164763
Whereas I would expect it to look more like this:
View attachment 67164764
In fact, the reflected light blue in the shadow of her sleeve against the poster doesn't make a whole lot of sense either. I accept though that this could be an artifact issue, or something else entirely benign.
Before I begin:
1) Images that do not have EXIF data (metadata) are more than likely edited.
1b)However, this doesn't mean that the image has been
edited to a degree that is unrealistic, it just means that it carries little information about its origins and thus can't be presented as something caught on camera and then lightly processed.
2) Editing is a really big word in the manipulations world. It ranges from simple cropping to the insertion of other images.
3) This image wouldn't be accepted by any photomag trying to publish an article on realism in photography.
This image
looks edited and I suspect that it is but not the way people think. The lighting on the subjects is borderline schizophrenic and there are shadows missing. The little girl has her arm extended - and yet in the "light streak" next to the boy, there is no sign of her arm. There is no shadow that would be attributed to the egg, and there is an abnormal shady spot on the plate the woman is holding.
As far as the poster is concerned, there is a faint shadow around the frame that
shouldn't be there. This can't be attributed to the architecture of the house because there are no visible objects in the frame that would even create that type of shadow (this is of course - assuming that the frame is one of those a half inch cheap plastic frames and not something thicker.)
Conclusion: The image is most
likely edited - but there is not enough information in the image itself to claim that the poster was inserted. It could easily be some photo intern that was sloppy with the dodging tools. Just by looking at the other images, I can guess that whomever did this is probably far more familiar with fashion photography. Everyone (even the dog) has been brushed and dodged. Their skin looks downright vampirish - with the exception of the girl who damn near made of gold to give her a warmer look. All of these things can be achieved with different tools in photoshop. However, I do not think that the poster was inserted in the processing stage.