Use the last tool to create the next layer belonging to the same earlier made bubble.



The layer’s parameters: Fill 0%
Blending Options>Gradient Overlay



Gradient’s parameters:

 



Make a mouse click on the same layer on Add a mask option situated on the bottom part of the layers’ palette and use simultaneously the Brush Tool (B) of black color to erase easily a part of the bubble’s surface.

 



Using the Ellipse Tool (U), try to make another highlight on the bubble’s surface.



The layer’s parameters: Fill 0%
Blending Options>Gradient Overlay



Gradient’s parameters:

 

 



Next we need to combine in a group all the layers composing the circle (press Ctrl button to mark out the corresponding layers and then hold on the left mouse’s button while moving the marked layers on Create a new group selection). Make many copies of this last made group and select again the Free Transform option to change the copies’ sizes and place them on the picture the same way demonstrated below.



The picture is finished!

View full size here.

Download PSD source (Tutorial ID 2999)!