For this image I was going for an impossible image of a chilled guy sitting on a wing of a jet. Impossible, right?
So I went to a free stock and grabbed the following image of an airplane:
And the following image of a relaxed guy:
First I had to cut out the guy from his background. To do this in Affinity Photo I used the Pen Tool to create a curve around him. Then I converted the curve into selection. Once the guy was selected simply create a mask.
This is a non destructive solution, as I can paint over the mask to hide or reveal content as required.
To fade the guy a little better into the image I had to add a Gradient Overlay on him. But what colours do I use? Well I extracted them from the image of a wing. Just go to Swatches -> hamburger menu -> Create Palette from Document -> As Document Palette and Affinity Photo will extract a number of colours. 68 in my case.
Gradient overlay applied to the guy.
Without Gradient Overlay.
With Gradient Overlay
As a final touch I added the Lighting filter from Live Filters on the guy. The settings are on the right.
The idea was to create (or correct) the lighting so that it would make sens in relation to the lighting in the original image.
As a final touch I added a lens flare.