i agree with truthseeker. pictures show us somethign tangible that we can picture in our minds. it puts a face to a name. like said previously, its essential that we do not worship these photos, seeing as that is prohibited.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-gurus/14776-gurus-pictures-and-portraits.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=14776

my question then is how did artists such as soba singh know what the gurus really looked like?

sorry if i hijacked your thread...