@MZD thank you so much, that worked just fine for me, but somehow the pictures i chose are kind of distorted, do they have to be like 300x300px? And how can I add a spinning effect and a white border to these pictures?
Personal CSS should go in yourwiki.wikia.com/wiki/Special:MyPage/wikia.css (for default Oasis skin) or /common.css (for all skins). See Help:Personal CSS and JS.
Wiki-wide CSS should go in yourwiki.wikia.com/wiki/MediaWiki:Wikia.css (for default Oasis skin) or /MediaWiki:Common.css (for all skins), but may depend on how old your wiki is. See Help:Community CSS and JS.
Yes, it finally worked!! Thank you all so much, though I have one more question: How can I get all three pics in a row? And I want the pics to be centered, like, right now you can only see the hair, you know? But I want the face to show.
But again, thank you so much for your effort, you all really helped me!