Technical feedback.

 It is very hard to cover mistakes up on an A2 size print. Such things as camera shake, sharpness, focus oh and a clean lens. ALL these will show up on an A2 image. Also, poor quality lenses.

What is the main reason for under exposure?

Camera settings are incorrect such as ISO, aperture and even shutter speed. 

The best way to overcome this is a light meter and a grey card. 

Montage 

Using an image of the gallery and an aeroplane, I added the two together by removing the aeroplanes background and adding it to the gallery. 

                                                Original 

                                                Original.

                                                           Finished product.

A very handy tool for adding elements to images which cannot be photographed together. I am enjoying this resource on both Photoshop and Adobe express.