These images are titled You Are A Priest Forever According to the Order of Melchizedek. They are not suitable for veneration. They are examples of speculative, imaginative images which appeared in Russia in about the 16th century.
The imagery is very confusing, showing the “New Testament” Trinity at the top (which is not canonical in itself). Then the Holy Trinity is again featured on the cross: God the Father, the Holy Spirit as a young man and Christ as a crucified seraph. The motif of the crucified seraph is clearly a Western import, adapted from the vision of St Francis of Assisi during which he received the stigmata. There is the eight-pointed star of the “Eternal Eighth Day,” the symbols from Revelation of the four evangelists.
Iconography is, at its core and essence, an expression and proclamation of the revelation of God to mankind. God revealed Himself most fully in the person of Jesus Christ, the incarnate Word. To show Him in types and shadows, in prefigurations, diminishes the fullness of His revelation.
St John of Damascus expressed it best:
Of old, God the incorporeal and uncircumscribed was not depicted at all. But now that God has appeared in the flesh and lived among men, I make an image of the God who can be seen. I do not worship matter, but I worship the Creator of matter, who for my sake became material and deigned to dwell in matter, who through matter effected my salvation. I will not cease from venerating the matter through which my salvation has been effected.
