Dreaming of alabaster means capturing a successful moment in art. The form carries perfection, and endures the test of time through the love and care you have put into creating the piece. This is to show your attachment to the subject of interest where you exert all your energies.
Dreaming of an art gallery means you are currently seeking inspiration to overcome life’s obstacles. Being in the art gallery, you are surrounded by perfection, the final creation from an artist. It can make you happy with a heighten sense of connectedness to tackle obstacles and difficulties.
If you are buying art pieces from the art gallery in the dream, then you are preparing and gathering resources to better yourself. The added extrinsic value of the dream is representative of you building intrinsic self worth in the waking hours.