I'm just writing this so that the stories more believable in the sense that Steve and Herobrine don't look the same... But don't worry that will come soon enough >:). Also I will update this in a later chapter as to not give spoilers.
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Steve
Eyes: Blue
Hair: Brown
Clothes: Blue shirt, purple pants.
Age: 16
Herobrine (disguise)
Eyes: Hazel
Hair: Blond
Clothes: What ever he feels like. Aka black pants, white shirt and black jacket.
Age: 17
Herobrine (True Form)
(Basically Steve but no pupils.)
Eyes: No pupils/completely white
Hair: Brown
Clothes: Blue shirt, purple pants.
Age: looks 17, is an unknown age.
Rose
Eyes: A mix of green and grey.
Hair: Light brown.
Clothes: Black pants, purple shirt and hoodie.
Age: 16