Add weathering textures
I use some high-res photo textures of weathered paper to further blend the subject and the background together. Those textures can be added in Screen or Multiply mode. I also used a colour half-tone effect on a duplicate layer of the image to give it a printed look. I reduce the effect here and there, and apply it in Multiply mode with Opacity set to 30 per cent.
Final colour touch-up
Once I’m happy with the end result, I always go back for a final recolour pass, just to check if I can achieve a better-looking image. I try to bring back a more balanced palette, simply by slightly exaggerating the colour balance: more blue/greens in the shadows, more reds in the mid-tones and yellows highlights. It’s really a question of personal taste. I hope you found this workshop helpful. Get in touch if you want to talk about some technical aspects or share your own art!