My bookshelves for all of my books were separate from the
reading corner. I didn't use bins. I just taped a strip on the
binding in different colors (green for science, blue for
geography, brown for botany, red for fiction, yellow for
cultural) and kept them sorted on the bookshelves like they are
in libraries. Sometimes a child would "fix" any out of place
books or we would do it together as a project. Overall, the
children did a great job keeping the books organized. I only
changed the books in the basket next to the sofa. Those would
have some seasonal books or the ones I read to the class as a
group. We had very few fiction books in our classroom. I kept
the ones we had that did not have talking animals - only
reality based as much as possible. The children would spend a
great deal of time looking at pictures of the non fiction books
especially those animal "dictionaries".
If I used actual "readers" I kept them in a separate area. I
wanted to be sure they were reading those books instead of just
memorizing the text.
I think your approach is very good and since it works so well
for you, I wouldn't change a thing. I was an interior designer
in my first career so I was strong in providing an inviting and
classic environment just for children. To me as long as the
children want to spend time in the area looking or reading
books, then you have a nice reading center. I have seen such
centers that were so over the top, that it looked like it was
more to impress the adults then it was to support children's
reading of books.
I agree with Flacka - don't sweat it - your reading corner
sounds like it is working just fine.