Why are the Gospels silent on the physical appearance of Jesus? We have four books which describe the life of Jesus Christ from His birth to His death and resurrection. All the four Gospels are silent about the physical appearance of Jesus. It won't take much words to describe the appearance of Jesus. At least some few words for His height, complexion, hair color, hair length, hair style, ugly or handsome, voice and body size will suffice.

Is there any explicit/implicit reason why the Gospels are silent on the physical appearance of Jesus Christ?
The prophecy of Isaiah 53 asserts that Jesus would not have any extraordinary physical attributes.  


  For He grew up before Him like a tender shoot,
  And like a root out of parched ground;
  He has no stately form or majesty
  That we should look upon Him,
  Nor appearance that we should be attracted to Him.  Isaiah 53:2 NAS


Thus, this affirms that there was nothing extraordinary in His physical appearance, so He was not likely seven feet tall nor did He likely have the physique of Arnold Schwarzenegger. 

As to why this was the case, the second of the Ten Commandments asserts that we are not to even make any images that could be used in worship.  The lack of description of Jesus' appearance seems to have a preventative effect to this end.


  “You shall not make for yourself an idol, or any likeness of what is in heaven above or on the earth beneath or in the water under the earth. You shall not worship them or serve them... Exodus 20:4-5a NAS