Framing should be museum quality.  Only acid free mats should touch the prints. Any others will slowly destroy the paper.  Prints should be suspended by acid free paper tabs that will tear before the paper of the print itself when put under any stress. Ideally they should be under museum quality plexi- glass, without the glass touching the print surface. (It's expensive, so regular plexi-glass is fine)  Usually Lagana's prints look best in light colored mats. Sometimes an accent adds richness.  More often just one simple mat is best.  

Lagana often leaves extra wide edges of paper around her prints, so some trimming may be needed, but leave as much paper as possible underneath the mat for protection of the print.  Between mat and print on all sides, show an equi-distant margin of 1/2"  to 1" or more so that the signature is displayed, 

Prints can be laminated.  If you wish a perfectly wrinkle free surface on the big prints, it may be necessary.  However choose a professional framer and use a reversible adhesive.

Japanese mulberry papers have flecks and other irregularities of hand made papers.  Over time some of these papers show light  oxidation spots from the impurities in the water used to make the paper.  These spots  blend with the paper.  If the print is kept in air conditioning, these oxidations won't occur or increase.