I love yoga...even though I came to it later in life! Here are some ideas for storage- 'float' a desk along a wall for you PC and hang book shelves on top and add storage underneath. You can get pre- made benches or find trunks, shelves, whatever works under the table. This will save room for when you add more furniture.

And an inspiration photo for later on:

Great space! See why you love it.

For storage add wicker trunk as a coffee table for in front of your sofa. They also have these sized for end tables to hold files.

Hammary T73256-00 Hidden Treasures Trunk Cocktail Table in Rattan Weaving · More Info

You could pull your sofa away from the wall and angle it towards your windows some. Then put a desk and a file on that wall it now occupies.

Espresso Finish Wood Home Office Laptop Computer Desk · More Info

Would having a mirror in there help with poses? You could add one between those two windows.

12th Street Brownstone · More Info

I love the idea of the mirror. I thought about putting in above the sofa so that the lotus flower reflects in it. Right now I ordered a curtain rail for the wall across from the windows, it will stretch out the whole length of the wall. I am thinking to hang one layer of flowy see through curtains and some accent curtains to layer on top for more privacy.

I totally loved the idea of the 2 pillows in the corner for meditation.