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8 x 6 in - 20 x 15 cm Watercolor
A quick 'sketch' from a 2 hour Challenge at PaintingFriends.com
This is the ref as supplied to the challenge.
The first layer was raw seinna and umber to get the yellow background. Then some wax resist to get the lines in the ceiling and what would become the stars in the blue part of the flag.
A phthalo green wash comes next. Once that is dry fellow blue and the cad red in the flag can go in and you are done. The whole thing took around 50 minutes including a couple of long periods of drying time for the yellow and green washes.