(I didn't read topic so I'm sorry if such suggestions were before)
There are two things I was thinking about for long time but didn't wrote here yet. So
1. New tags appears pretty frequently and actually there is no way members of e-shuushuu know about them if they doesn't visit appropriate forum topic. For example, I become familiar with new tags only if somebody point it in image comment
Same thing for some rare tags: image uploader may not apply tag to image if he don't know about it.
So I think it would be useful to bring information about tags on the main e-shuushuu page. For example in top-right corner, instead of arbitrary tips. Everybody who use e-shuushuu for few weeks become familiar with rules pretty good so I think it's not a thing to show on every page to all members. Instead, e-shuushuu can show there information about random tag: it's name and description. So members will become familiar with most tags.
2. It would be useful to jump from Similar Images Search page right to Image Upload page so one wouldn't need to upload his picture again. Or maybe to place upload form on page with Similar Images Search results.
Before uploading any pictures to e-shuushuu I check them through Similar Images Search and remove all existing ones. And then upload rest ones again on Image Upload page. If images are large enough it take pretty much time to wait
. Not mentioning about e-shuushuu's engine doing same work twice.