Thanks for your answer

I think like you Danob... Yesterday i make some shot  in nude artistic and I like to play with the slow lighting and the courb of body. I think this man say me that because he make photo portrait and for that it's necesary to have a very nice reflect light...

Yes Onslow, I have this materials and more umbrella effect I make me alone with wire netting and other support. Tomorrow i will go to see that...