Was talking to a friend about this the other day and thought I should just share this tip with everyone. Using layer blending modes is a great way to shade quickly in Photoshop and almost everyone will tell you that Multiply is basically the go-to for adding shadows, but about a year ago I started using Color Burn layers to lay down shadows and I am much happier with the results.
Multiply layers, even when you use a fairly saturated color like I did here, will take the vibrancy out of the colors underneath it. Color Burn will keep your mid-tones really saturated so it looks great on colorful subjects like birds and so on. Also Color Burn responds to both Opacity and Fill % so you have a little more control over the intensity of the effect.
I love using Color Burn to do a sort of “underpainting” which I then paint on top of with a Normal layer to get everything how I want it, since leaving the Color Burn shading as it is can be a little too intense. I really recommend trying this! Hope this helps you guys~