The previous instrument (Ellipse Tool (U)) should be used for representing the next layer belonging to the sign too:

The layer’s parameters:
Fill 0% on the layers:
Blending Options>Stroke

Press Alt button now and make a mouse’s click between the new recently made layer and the layer before this for the upper one to be applied in the limits of the lowest one.

Choose the Rectangle Tool (U) to draw a kind of highlight on the left side.

The layer’s parameters:
Fill 0% on the layers.
Blending Options>Gradient Overlay