I think the layout is fine as it is. Tweak things as you go, but don't add too many images.
It will run slower on mobile devices, and slower computers.
Simple is always best when it comes to design. You don't want it to be too busy where users don't know what they're doing or where to go next (That's my current problem with the neopets site. Too much going on all at once. It's overwhelming@.@)
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