When people were healed by Jesus Christ, they simply needed to touch the hem of his garment.
Their faith in Jesus was so strong that this was enough.
Guru Siyag, in his compassion, has created his Siddha Yoga as a way for non-believers to methodically believe in his unlimited power to heal and enlighten.
For me, there is one simple place on his head that is enough to transport me to the real Guru Siyag which is not a body at all. Though the meditation says to focus on his image, whatever feature of Gurudev tells you that he is The Comforter is the one for you to surrender to.