Lyon, ruins of an ancient theater

The sketch was made with liners and a graphite pencil from nature in the French city of Lyon on the ruins of an ancient theater.
Where are the ruins here, you ask? And you will be right, the antique amphitheater "did not enter the frame." I was fascinated by the trunks of the wonderful Provencal pines growing around the amphitheater.
However, a certain number of marble fragments can be seen in the foreground and background.
The price is for three works, this one and these ones:
https://artnow.ru/en/gallery/2/23714/picture/0/1045453.html
https://artnow.ru/en/artists/2/23714/picture/0/1045515.html