Yes you can go to the bar and get some good pictures including pictures from your own room if you are staying there. This month (March) full moon is on Friday March 21 and the Taj Mahal is closed every Friday except for prayers at the mosque. There will not be any night viewing allowed on that Friday night from within the Taj Mahal compound. Normally the two evenings before full moon, the evening of full moon and the two evenings following full moon have night viewing in small groups of visitors. During the night viewing one is not allowed to get close to the Taj and the viewing is restricted to a very short time to allows several small groups.