Isa van Dee Zee framed picture guitar phantasy 2’ x3’

The only issue with this is in the bottom left corner of pic, there are some marks under the glass. It looks like some dust got under the glass but I don’t want to take the pic apart. Im not sure what those little white specs are there. They weren’t there before and the pic has just been hanging on my wall. See pics 3 and 4. Really cool abstract guitar pic professionally framed. Isa van der Zee is a Dutch Postwar & Contemporary artist who was born in 1928.