Hi Becky -- thanks for posting to History Hub!
I'd recommend starting with the U.S. Senate Historical Office. They maintain a photo collection of approximately 35,000 still pictures, slides, and negatives. You can reach them via email at firstname.lastname@example.org.
The Senate Historical Office has put together a series of room histories. I don't see anything on the Committee of Education and Labor, but some of the background information here may be of interest.
You can check in the Congressional Directory in the 67th Congress for a map of the Capitol building with room assignments -- jump to page 268 if the link doesn't take you right there. The committee room of the Senate Committee on Education and Labor in 1921 was on the ground floor.
The Library of Congress Catalog is available online -- a search for 'senate committee room' brings up a number of photos. You can also submit a request directly to the Prints and Photographs Reading Room through an online form.
You can reach out to the Senate Historical Office and Library of Congress with the information you've provided here -- if they need more information to work on your request they'll follow up with you.
I hope this information is helpful!