I know this is an extremely old inactive post, my apologies if it's against the rules to revive things like this. But, it's one of the few posts that popped up for me when I searched Tu'er Shen so I thought I'd contribute to the conversation incase anyone else stumbles upon this post the same way that I did.
Personally, I decorate my altar with any rabbit statues I can find. This lunar year being year of the rabbit made them pretty easy to find, otherwise I always try to hit the clearance Easter decorations. I think what's important is having things that are symbolic of the god, even if you can't get a direct literal representation of them. An image should be fine, too, though! I can only speak to my own practice, but I believe intention is everything. If you are intentionally calling out to a certain god, they're likely to take notice
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