Pink sunrise.

Actually that didn't look so pink as here, filters, especially skylight produce this effect.
f11, 1/5s, CPL + gradient grey.

f11, 1/2s, CPL+skylight L1A.

 f13, 1/3s, CPL + gradient blue.

Umber-like dawn.

Let's make like that. A couple of filters and a bit of skills.

f11, 1/3s, CPL + gradient grey.

 f11, 1/3s, CPL + slylight L1A.

 f11, 1/5s, CPL + gradient grey.

The latter one is obviously gloomy. Quite correct, like everything here.