Some of my favorite artists have pieces in the Orsay - Monet, Manet, and Degas to name a few. I especially love Renoir's Bal du Moulin de la Galette. Unfortunately, you can't take pictures inside of the museum (except for overarching shots from specific lookout points).
If you ever find yourself in Paris, I definitely recommend spending some time in this fabulous museum. Just getting to see the inside of the train station (without the art it contains!) is worth the price of a ticket. And since the museum is much smaller than the Louvre, you can truly feel like you've done it justice without becoming extremely exhausted in the process.
Our attempt at a self portrait outside of the museum...
I love the clock!
The view through the clocks at the top of the station is stunning!