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It is important for every highlight to have its own layer, because then you can arrange each one exactly as you want it without affecting the others. So make a new layer for every highlight, unless you are copy/pasting a previous one as a new layer. Give them some name that identifies them. I use hl1 hl2 etc (for highlight 1 etc).

If you look at the light on our box, at the top left corner of the wood frame, you can see that the light direction is from top left. That means that highlights at the top and left of our box should be sharper and brighter than those on the right and towards the bottom.

We will start with a simple ellipse. Use the shapes tool and set the Styles and Textures boxes and the tools palette as shown here.

Draw a small ellipse in the top left corner of your image.

Rotate it as shown here, and arrange it across the top left corner of your glass.

We can copy/paste this highlight as a new layer and drag it down to the bottom right of the glass. Because that is further away from the light direction we do not want it to be so sharp and bright here.

So first use Effects>Blur>Gaussian blur with a radius of 1.5, and then pull this highlight's slider on the layer palette back as shown here.

The finished highlight looks like this.

Still using the ellipse tool and the Styles and Textures settings as before, we can add some small circular highlights right in the middle of the glass. For these little dots I don't mind putting them all on the same layer, but their own layer as the centre highlights, so they can be moved without disturbing the side and corner ones.

For the final highlight we are going to use the bezier tool. Select the pencil tool, Set the Styles and Textures and tool palette as shown here.

Draw across the top right corner of the glass, and click where shown on the left, and again just to the right but the same distance from the line. As this highlight is over to the right, use Effects>Blur>Gaussian blur with a radius of 1.5, but as it is at the top of the box we do not draw the layer slider back to make it transparent.