Here's the process video for my glossy surface studies! Here's the final result of the session:

Some info about this process:
I forgot to screen-record the first couple of minutes of sketching, but I had a phone recording! The screen recording starts at about 2 minutes in.
It has been sped up by 250%, so 2 and a half times the original speed.
This session took me about 2.5 hours in total.
I also made a resource video about my process for creating these studies, which will be uploaded in a few minutes. Be sure to check that out if you want some commentary and additional info on these process videos, as well as tips on creating paintings like these!