Play with layer overall opacity.
Create another layer somewhere in the middle and fill it with Gradient (dark blue to black).







Add a layer mask right to this layer (Layer>Add layer mask>Reveal All).



Use black to white gradient (black-exposes, white-hides effects).



Well that is about it for our concept.

Final steps.

And Bevel and emboss to the biggest object (in the layer styles).



Then select the round dares using the elliptical marquee tool.







Use select inverse command, further the selection and use blur more and Gaussian Blur Tool on the selection.