Like, one trait said smart in writing, but not in science or math. You could make your character look somewhat like a bookworm.
 Don't have an extremely shy girl have bright blue hair. It just seems silly.
 Brown eyes say warmth and comfort. While those chilling, icy blue eyes send chills down your spine.
 Along with the height and weight. But, remember that you must make the height and weight believable for the gender and the age.
So, you want to make the character's looks somewhat coincide with the personality.
You can choose a hair color, but keep it reasonable with your character.
When you are looking for the right eye color, think about what the color says to you.
For the way their body is built, base it around the personality.
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