Glass window painting
certainly a challenge - especially in 40 degrees of heat!!! Glass paint is so temperamental  and not easy to apply on larger surfaces. Also use of leaded light medium However the customer is very happy with the result - and we have 3 more windows to go once it becomes a little cooler. The Mauratania and Concorde have particular memories for the commissioner, as do the Oriental Dancers. at tomes, particularly when applying skin tones to faces, I used a hand mirror to ensure the effects as I applied my brush strokes to the ' outside' face of the glass - there was simply no other way!, 
I don't believe that such a spectacle as these windows will be seen on any other house in Cyprus, and albeit that I had a love / hate relationship with the windows, the results are really very satisfying.
The term used for the application for the outside of the windows is Reverse Glass Painting - 'Reverse paintings are  challenging to create as one must, for example, in painting a face, to put the pupil of an eye on the glass before the iris, exactly the opposite of normal painting. If this is neglected the artist will not be able to correct the error as they will not get in between the glass and the paint already applied. - (reverse glass painting - Wikapedia)