Lets start with a sketch

Make it a lower opacity, and on a new layer lets add the first color

Clip a new layer on the base color, and start adding some shadows

Do the same thing but add a lighter color for the highlight

Use the lasso tool and the airbrush to add extra soft shadow

Change the background color

Duplicate the base color layer , change the color and make it larger

Now use a soft eraser and erase parts of it

You can repeat the step to add an extra layer for the glass tickness

Now add extra details

We need a bit of sparks

And a bit of color adjustments

And were done