The Bible describes Jesus, in life, in very general terms. From Isiah 53 comes the following:

For he grew up before him like a young plant, and like a root out of dry ground; he had no form or majesty that we should look at him, and no beauty that we should desire him.

For Jesus to have been physically appealing might serve to diminish his spirituality, the fact that we might be drawn to him rather than the God he represents. 

As far as his heavenly description, check out the verses on this page. It is unimportant how mankind, in his limited capacity to understand, has previously depicted the appearance of Christ on earth.