Also, don't tilt the opening of the tube towards the audience BEFORE you stick your arm through it . Hold it out to the side (opening not towards audience) then stick your arm through it , and with your arm still through the tube then rotate around towards the audience with fingers spread wide ... and keep it moving ,don't linger in that position.
Oh, wow, I wonder where the bouquet of flowers come from ? (oh, wait, no I don't , because you already revealed where they come from in the title of your video. Maybe you could name it "Appearing Bouquet of Flowers" or something that doesn't give away the secret ?)