Every painting and picture is based on the belief. You are talking about Guru Nanak Devji's portrait. If we ask you have you seen the picture of your great grand father or his father. That is not more than 300 years old picture. I hope you will not be sure. Sikhism came in to existence in the fifteenth century. Whether any body can be sure about the picture of the Gurus. It is all our faith.HOW COULD SOBHA SINGH KNOW WHAT GURU NANAK DEV JI LOOKED LIKE? AS I WROTE IN ONE OF MY EARLIER POSTS, THESE PAINTINGS LOOK MORE LIKE SELF-PORTRAITS OF THE ARTIST HIMSELF.:::singhsippingcoffee:
The sikh holy book called as Guru Granth Sahib contains the teachings of the Gurus and includes passages from both Hindu and Sufi saints. In the composition Honourable Gurus have referred that it is dhur ki bani or the word of primal divine source. The primery source will be called no intermediary but only the word of God.
I am not a Hindu, nor am I a Muslim. My body and breath of life belong to Allah, to Raam ---the God of both. Says Kabir, this is what I say meeting with the Guru, my Spritual Teacher, I realize God, my Lord and Master----Extracted from Shri Guru Granth Sahib.