Ah, great to see your submission DarkOwnt, nice one
I think you and Brett were both much more ambitious than me for the amount of detail you both tried to capture in your subjects! Good for you
And yes those 15min do pass very quickly!
I just went for a single, generic shape with sloppy watercolours and no reference to worry about! But I was still 1.5 over the 15!
Doing this little challenge felt very much the same as doing a timed life drawing pose, where a 15 or 10min time limit is quite common.

I do hope some others will have a go at this and post their results.
But I would encourage everyone to have a go at this, even if they don’t post here, as this is a good exercise anyway which helps you focus on what are the important elements of a subject which you need to keep and what you can edit out without loosing the meaning of said subject.