I like it as it is,Henning. I had thought that opening the lens up more to throw those diagonal lines more out of focus would help but the more I looked at it I don't think it would have made that much of a difference. Nicely done.
Changing the shutter speed to 1/250s would have been possible, if I at the same time would increase the flash. But keeping the ISO and aperture fixed at the same time would also mean that the background would have been two stops darker and this is what I tried to avoid by shooting close to the ambient level of light.