Этому способствует... прежде всего

Этому способствует... прежде всего сама каноничность иконописи, строгая ограниченность сюжетов и композиций, их иконографическая определенность, наличие образцов, по которым из века в век писались те или иные сюжеты

Results (English) 1:

This is facilitated by ... first and foremost, the canonicity of itself painting a strict limited subjects and compositions, their iconographic certainty the existence of samples on which for centuries were those or other subjects

Results (English) 2:

This helps ... especially the very canonical iconography strictly limited themes and compositions, their iconographic certainty, the presence of the samples, which for centuries were written certain scenes

Results (English) 3:

this contributes to the... the primary каноничность icons, the strict limitations of plots and compositions, their иконографическая certainty, the availability of samples for which ages писались those and other stories