User blog:Clumsystiggy/Wordmark Help!

Hello! I've been slowly building my own wiki, (find it here) and i've recently had some issues and quetions about wordmarks. Wikis I often go on, such as Jurassic Park wiki have nice wordmarks, however when i try and resize and enter my new design, it is either too big, small, or the wrong file type. My main setback right now is that my logo is WAY too small and compressed. Does anyone here have any ideas, advice or ANYTHING really so i can make my logo bigger or design a new one. My wiki is about extinct life, it is called Prehistoric wiki.