The one on the sticker is normally written as 宮 (miya - big shrine, palace). There is a way of writing Kanji that makes them even boxier than the standard ones, often for use in stamps that painters use to sign their work. This looks like a stylised version of that with a thicker brush stroke where they just extended the little vertical lines downward. For fun.

The hand painted ones are upside down. No clear idea how to read them honestly because the combination doesn’t appear to be used much or is a place that is famous enough. 美 (maybe mi - beautiful, august) 峰 (probably mine - mountain ridge). Could be a place or a quote from a haiku where shit gets condensed like a tweet or something.