There aren't many differences between humans and halfelves in looks and those are probably too small to add to a game. The important differences are that it gains some elven abilities in a lesser form (for example elf immunity to enchantment spells. halfelf +2 bonus on saving throw).
Half-elves have a ears that are a little bit pointed (not so much there would be difference in the game) From my p&p phb:
Half-elven height 5-6 foot, weight 90-180 pounds. Half-elves are paler, fairer and smoother-skinned than humans but skin tone, hair color vary just as human's does. The shape of the eyes still is almond-like.
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