Corona around the planet

I created a layer called Corona to give the planet a bit of oomf!
I drew a circle using the elliptical marquee tool and then made the circle thicker and used the linear dodge blend tool.
 
I used an inner and outer glow and then changed the advanced blending omitting the Cyan colour range.

This is the planet with the layer and corona.

I then created a light source so the planet would have another focal point. I used a large brush and colour light blue to paint an area on the edge of the planet by using a layer called light source.

At this point, the stars looked small and insignificant so I created another layer called stars and used a small brush size spatter mode to create more stars.

This give the overall feel of a real planet now.