Christmas is over and Santa finds himself without a job until the end of the year. So, he drowns his sorrows in the bottle...

The lens flare was not added in post-production. It is just a flat rectangle positioned along the camera's axis (https://www.daz3d.com/ptf-optical-fx). This trick works well and we can add more planes to add more effects. The only problem is with the fog effect of the rendering that shows the edge of the place. You can notice it on the left of Santa (I didn't correct it on purpose!).
Environment from stonemason.