Fill 70% on the layers and change again the Blending Mode – Normal to Overlay.

Create a new layer and choose the Brush Tool (B) with blurred edges and the colors from here: 5C0003, black and 221327 and patch out the zones near the spheres, Place this layer under the layer containing the small circles.

Change the Blending Mode – Normal to Overlay on the layers’ panel.

Create a new layer again. Select the Brush Tool (B) and choose a brush of green, red and blue colors to represent radiance around the spheres. Place this layer lower than the layer containing those big spheres.

The upper panel (the brush’s parameters):

We should have the next picture on the final stage:

Finished!

View full size here.