In the midst of all this biographical litter, a miniature portrait of her appeared.
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"biographical litter"
Kind of a cruel way to describe all the shit that means the absolute most to one single person and practically zero to every other person who ever lived (at least until a date far into the future where somebody would be completely intrigued by finding a thousand year old wallet full of ephemera. Of course, it would still mean zero to them). Cruel but, I suppose, fitting. Even are disgusting shells are eventually just biographical litter.
"miniature portrait of her"
I think I can safely assume, without reading further, that "her" refers to Erlys. Unless this is some Freudian thing! Which it can't be because it's obviously Jungian. Merle misses Erlys and his mind wants to make sure he knows it.