Thank you guys, your opinion means a lot to me !
JBA : it's quite bizar, the pics show the irisses on top of my roof as if they are all of the same length indeed.
I used this photo for reference :
When I look at it on my work table, there is more variation in the green and brown-yellow tones, and in lengths of the plants, compared with the pics of it. I'm afraid now to ruin it, but I will try to do better next time. Thank you very much for your opinion, I appreciate it a lot. G.