Mainly because I could not trick my mosaic prog. into making a portrait of Paulina Porizkova lol. Since I had the pic of Twiggy, I went with it. And no, I did not glue them together, I pressure fit the frame around them, then glue the back board to the frame, nailed to the frame and put plexiglass on the front. I then cut small triangles of the plexiglass i had left over and drilled holes in them and nailed them at the corners to hold the plexiglass in place. I used 3/4" by 1 3/4" moldings so I needed to use these tiny nails and still managed to crack in one corner
It took me about a week to make, but elapsed time maybe 12hrs give or take an hour.