Steps to improve the current implementation
01) Use this, harmonized (on a 24dp canvas), version of the OOUI talk pages icon:
02) Users access their talk pages via overflow menu (already implemented). Please make the entire bottom sheet visible though. A part of it is currently cut off (see Help link):
03) Adapt copy of preview bottom sheet from Read article to Open talk page. Also, is it possible to preview text in addition to the images on a users talk page?
04) Please set overflow-x to hidden to avoid the odd horizontal space.