The garage is very dark and throught it's large door the Sun comes in from the South. It was in the morming and the Sun was not very hight at this time of the day. No, that is not correct.
The entrance is not very hight and the quantity of incoming light is not very huge as we could suppose by the position of the large star and the time of the day. This time - for a change - I was using the two flashes both on stands triggered by remotes non TTL (I am missing now it's name/brand) with the Canon 5D + 24-70 f/2.8 L USM as usual these days. The 580 EXII was with an humbrella and all the shots were done with the light throught it. No ETTL then and all Manual flash. I am using Lightroom now and I converted two pictures to B&W. Some minor adjustments were done later.