JOEL - According to the Book of Ether we learn that the spirit of Jesus looks the same as His physical body would:

"And never have I showed myself unto man whom I have created, for never has man believed in me as thou hast. Seest thou that ye are created after mine own image? Yea, even all men were created in the beginning after mine own image. Behold, this body, which ye now behold, is the body of my spirit; and man have I created after the body of my spirit; and even as I appear unto thee to be in the spirit will I appear unto my people in the flesh." (Ether 3:15-16)

And in the D&C:
"... that which is spiritual being in the likeness of that which is temporal; and that which is temporal in the likeness of that which is spiritual; the spirit of man in the likeness of his person, as also the spirit of the beast, and every other creature which God has created."(D&C 77:2)

So it is logical to assume that our own spirits looked the same in the pre-earth life as our mortal bodies do now, although it is hard to know if the word "likeness" means that a person's spirit looks exactly like his physical body or just sort of like it. I would assume that the spirit would look like our mortal body when it is in its prime condition. As you say we do take on the traits of our parents, so I assume when God created our spirits He knew how they should look because He knew who our earthly parents would be. Of course since in the resurrection our own mortal bodies are raised from the dead, there is no reason to think that they would look any different than they do now, except of course they would be restored to a prime condition with no infirmaties or deformations that they may have had during life.(Alma 11:43)