[jmg]

Originally Posted by Antetokounmpo

Any good tutorials/tips for adding the fake sun?

I like this method:

Which leaves you with a lot of flexibility in changing the color and effects. It's a good starting point. I also save the flare for use in other photos.

In use here:

Before:
Lunch Break - RAW by JMG, on Flickr


After:

Lunch Break V2 by JMG, on Flickr

and here:

Fall by JMG, on Flickr