First off since christians believed that Jesus was God in the flesh and the OT said not to make any graven image of anthing in heaven I think they had serious doubts about describing or issuing a portrait. More importantly your wish is irrelevent to the purpose of Christ coming.
It is not reading that troubles you but understanding. Read John 12:44-50.
What they saw was His character, His testimony, and His works. The Father is who He represented and the Father has no form He is Spirit.
Read the context: Jesus ask "Have I been with you so long, and yet you do not KNOW me. What? They should have known what He looked like -no He is talking about knowing Him in a personal and trusting manner reguarding Him being the Messiah - all of which was prophesied in the OT regauring His lifes purpose and mission. Take the scales off your eyes. The testimony of Christ's life, character, works, and ressurection is enough. We don't need your arbitrary desries for proof in the form of some picture or physical description of Jesus.
Read Matt. 13:11-23.
"Awake you who sleep, Arise from the dead, and Christ will give you light."
"Let your light show shine before men that they see your good works and glorify your Father in Heaven" - I think Jesus was the Example. Duh!
"Thomas, because you have seen me you believe. Blessed are those who have not seen and yet believe..." Jn. 20:29-31.
Also Read John 17 particularly v.6-8
Also if you have to have a description - here is one in Isaiah 52:14; 53:2-3.