I had a wonderful holiday in Krakow a few years ago - stayed in the Hotel Alexander, (can't remember the name of the road it's in) there was an Art Glass shop in the same road, one of only two I found there (apart from Jablonski and lampwork animals and christmas tree baubles). I think the two shops I found were related - the other was in the main square.
I bought an orange-and-yellow-enamelled stripey cat in the shop for my brother's partner - it was of exactly the same sort of construction as your angel - flat base, upright slab of glass (both with cellulite texture), with etched marks to delineate features, artist signed.
Can't for the life of me remember the name of the artist - I gave the info. to the recipient, goodness only knows where it might be now!