For your convenience: http://www.bl.uk/manuscripts/BriefDisplay.aspx https://collections.vam.ac.uk/category/manuscripts/THES48922/ https://www.si.edu and https://asia.si.edu/collections/ https://library.harvard.edu/digital-collections https://viewer.cbl.ie/viewer/ https://www.davidmus.dk/en/collections/islamic https://www.agakhanmuseum.org/collection and https://www.agakhanmuseum.org/collection/artifact/court-of-kayumars-akm165 (ok, because is my favourite painting!)
Please add to this list!
Wow thank you!!
Welcome Jenny! There must be more... maybe you know of some Australian ones?