Mist

It's not bad. Try to create a layer on top of everything and fill it with black. Then set it to 'Saturation' and turn it off every now and then to see if the values are right. Because right now it looks like the center of the sun/source of light is darker than what surrounds it. But, it's not actually bright. You're under the impression yellow is bright, but the value just isn't correct. Try to look at reference images on Google Images or something-- that's what I always do if I don't know how to paint something. The center of the sun should be more like-- white, as in, really bright.