We are almost done! We will add some bubbles around the model as an indication of the model’s movement in the water. We will create a bubble custom brush first. Create a new document (Ctrl+N) with a size of about 500 pixels high and 500 pixels wide. Take the ellipse tool (U) and create a black spherical shape. Don’t forget to hide the background layer by clicking the eye icon next to this layer.
Mask the shape as indicated in red highlight. Right-click on the shape layer in the layer panel to show the layer option and choose Rasterize Layer.
Finally go to edit > define brush preset. Name this brush, say, bubble.
Next, we will add some bubbles to the scene. Create another new layer below the brightness/contrast layer in the main document (step 21). Load the bubble brush previously created. Open the brush preset (F5) and set the brush stroke.
On this new layer, paint the bubble using the color of #76b2be. Try to vary the brush size to create various sizes of bubbles.
And finally, select the topmost layer and hit Shift+Ctrl+Alt+E to merge all the visible layers into a single layer. Name this layer, say, final. Go to filter > sharpen > unsharp mask to sharpen the final result a bit.