That is normal.
Your Oscar is not a true "albino". True albino Oacars have pink eyes and no coloration at all. What you have is a "Lutino" that is what probably 90% of these white based Oacars are. They will have black eyes and can have like yours black in the fins. It may stay or it could grow out. Only time will tell. The orange Oscar's get is not part of this color differences between Albino or Lutino. It's the eyes and and color on the body. Albinos will be white with some slight pink areas only.
This 1 inch oscar with 6 spots on each side
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Turned into this beast in a years time
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For now it looks fine to me. We won't know its final looks till it gets there. I will suggest giving it some freeze dried krill as treats. Will really bring out the metallic orange that Oscar's have.