During this shooting, I was stopped another time by security guards. This time was in a public park, and they said to me that it was not permitted to shot with tripod, saying that it is considered professional photography and then, I needed a permission from the city council. So I asked them if I could without tripod, so I shot long exposures using fixed surfaces. In this example, I use a support on the fence.
To process this picture, my French HDR photographer buddy Anto XIII suggested me to try Oloneo PhotoEngine HDR Software for blue hour and night shots and this is my 1st attempt. I am happy with the result because with other softwares, I had problems with the clouds motion in the different exposures and with Oloneo, I got what I wanted and later I could mix the HDR processed file with the 0EV exposure.
Canon EOS 450D | Sigma 10-20mm f4-5.6 DC EX HSM @ 10 mm | f4, 81s, ISO 100. HDR/DRI from 3 exposures @ [-2 EV .. 0 .. +2 EV ]