Hello all,
Pedro, Steve, Marc, Alexandros, Charalampos and Simon thanks a lot for your encouragements.
Terry, the Ivy is from a Japanese company called Kamizukuri, they make paper plant of a good detail. The only probelm with the Ivy Set is that it's cut down to up : meaning it is supposed to be climbing Ivy, not the one that goes from top to bottom.
I hade to turn down all the leaves, which is a dangerous job as the leaves are made from thin paper. Real Ivy grow on heavy roots, which is not flat, and which can create complex structure. For the roots, I used part of a product from Hudson and Allen, iit's like brown plastic fiber and it is supposed to be the underlining structure of a brush. You glue that together in the disared shape. It can also work with dried roots (if you want to make them appearing, it's even better). And then you glue one by one the ivy leaves.
I under coat the leaves before gluing them with an airbrush with a green acrylic, then painted the white lines on the nervures, and then painted each leaves with diluted dark green oil. When you look at real Ivy, you realise that the ivy is not uniformly green, the youngest leaves are much more clearer. So you have to changes the tones of the leaves to break monotony.
Best and thanks again for your support
Julien