Now I want to separate the upper part of background from the lower part. For this I'm going o use quick mask.

illustration of some king of sea base



illustration of some king of sea base

I've copied the upper part to a separate layer. You could see this in the layer box that the upper part stays on the separate layer.

illustration of some king of sea base



illustration of some king of sea base

I've also overlayer the top of the image with cool gray background with layer mode is set to color burn.

illustration of some king of sea base

Transform this cool gray gradient layer a little bit. But this is not very necessary to do. That effect It has could be hardly seeing, but anyway…..

illustration of some king of sea base

I've now made a selection, a small one and put it to color burn filling it with gray.

Now I've made about 70 copies of this layer. Well it can be done easier that it sounds. Just hold ctrl while dragging the layer.

illustration of some king of sea base



illustration of some king of sea base



illustration of some king of sea base
 


This way we made some value to our background.

illustration of some king of sea base

Now you can select all these little black layers. And merge them together.

illustration of some king of sea base

Now to the architecture; Use outer Glow to each of the ARCS, select cyan color.

illustration of some king of sea base

Layer styles can't do all of it. So create a new layer choose a soft brush and paint some of the reflection and other details.

illustration of some king of sea base

We will make some bubbles by setting the basic rough round brush to scattering.

illustration of some king of sea base



illustration of some king of sea base

Also a little bit soft green, crop the image a little bit and we are done with making a sea base.

illustration of some king of sea base



illustration of some king of sea base



illustration of some king of sea base

Hope you've learned how some elements can be done ever without a tablet.

illustration of some king of sea base