Wow, thank you for sharing, this is such a nice depiction of Buddha Shakyamuni on the rock! There are many ways to present a Buddha image outdoor, apart from the Buddha statue, painting a Buddha image on the rock is also a great way to make Buddha image available to benefit all sentient beings. I am glad to know that Buddhism is starting to flourish again in Russia.
The Russian government is very kind to allow the Buddhist community to paint a Buddha image on the rock. It is said that the bigger the Buddha image, the better and more merits we are able to collect. The merits we created is as much as the atoms that are used to construct the Buddha image.
We may not know this, but by having a glimpse of a Buddha image or circumambulating a holy item, a Dharma imprint is planted in our mindstream. We may not practice Dharma in this life but in our future life, when the condition is right our Dharma imprint will open up and we will practice again. Therefore, constructing a big Buddha image is very meritorious.