Just a huge amount of handwork, with blending all the layers and finding a way to make them match each others. Tried to do a clean cut with the bird (seagull) and give it a better coloring too.
I gave some colours for the bird(s) and spend a lot of time altering the colours for different source pictures, as the colour palette was very different in each.
Tools used: layer blending, masking tools, warping tool, perspective tool. Hue/saturation and colour balance tool+channel mixer. Clone tool and render/lightning effect.
A slight gaussian blur added finally with some colour tweaking, to remove excess colour from the lower part of the image (mostly red). (1 year and 359 days ago)