Smartie pants Sassan.
Very neat, and how you did that may be of interest to those unable to get black acrylic or have anywhere to paint a sheet of glass.
I would be interested anyway.
I see you did this work on image 1 ( black paint v velvet ). It would be interesting to know if your method works on image 2 ( black paint v mirror ). As you can see from that the mirror gives a lighter reflection, and the size of the double reflection can to a degree be controlled by angle of view. ie taken from higher angle then it would be closer to the double reflection from velvet and glass.
As for me I do not have your photoshop skill so have to find a way of doing it in camera hence going the Rudra glass way.
I was about to paint my new larger sheet of glass but will hold off in case I need to do a pic with black velvet to try your pp method on.
Don