is the main RIL where images are uploaded.
We have categories and sub-categories for most things, as you can see
Scroll down to the category for 'People'
and choose sub category 'Costumes'
This is the most appropriate place for these pictures and where members would look for such images.
From any page in the main RIL Index, the upload button is top right of the page - the blue bar which says Home ˇ Search ˇ Profile ˇ Upload Photos
If you have the raw photos, upload without resizing - the uploader can take up to 3.5MB (as explained in the thread I pointed you to) - the ordinary WC uploader you used here automatically re-sizes images to be 800pixels or less, so I suspect these images have shown smaller than your originals.
I won't delete any of these until they are in your own 'folio here in the RIL