Hello! We are now onto appearance which is on of my personal favorites!
But, one thing you do remember is that you shouldn't make them look perfect. Especially if they have a good personality because this leads to your oc becoming a Mary Sue or Marty Stu. Even with appearance you want them to have flaws.
I think being as descriptive as possible will help here. It will also help you picture what they look like.
So to help I will make a list of things you should know about your oc...
-What does their hair style look like? And is it long? Short? Medium? Do they even have hair?
-Is their hair curly? Wavy? Straight? If they had hair what would it be?
-What color/s is their hair? Is it dyed that way? What is their natural hair color?
-How do they style their hair? Braids? Ponytail? Nothing?
-What color eyes do they have?
-What shape are their eyes? Almond? Round?
-What about their eyebrows? Are they bushy? Thin? Barely there? Unibrow?
-What shape are their eyebrows? Straight? Arched?
-What is their face shape?
-Do they have full or thin lips?
-Any piercing?
-Do they wear makeup? If so- what?
-How tall are they? -How heavy are they?
-How thin are they? Average? Heavy?
-What do they like to wear? ((I think polyvore is great for putting together outfits for oc's))
-Do they do their nails?
-Do they have a gum or toothy smile?
-Do they wear any jewelry? If so, is it special to them?
-What is their favorite thing about their appearance?
-Do they overall like how they look? If not then why?
-What do they smell like?
-How do they walk? Strut? Confidently? Slowly?
-What does their nose look like? Big? Small?
-What do they wear on a day out?
-What do they wear on a casual day?
-What do they wear to somewhere formal?
-Do they have big hands/feet?
-What color is their skin?
-Do they tan or just burn?
-What are peoples first impressions of them after just seeing them?
-Do they wear a lot of a certain brand?
-How long does it take for you oc to get around to go somewhere?
I hope that list of questions helps when deciding what to make them look like. If you want more you could always search for appearance character developing questions.
Next update I believe will be powers.

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How To Make Amazing OCs
Non-FictionThis book is for creating oc's, and I hope it can help you when creating one or improving the one you have. :) I have made a lot of oc's and read a ton on how to make them, so I feel qualified enough to share my thoughts and help create awesome oc's...