They are painted by Vrindavan Das, a disciple of Ananta Das Pandit. The paintings there are a part of a big painting on the wall of Ananta Das Pandit's ashram at Radhakund.
I am working on a website for Vrindavan Dasji, which should be out in a week or so. I'll announce it here.
The website is now completed, you can view it at
http://www.gaudiya.com/art . If you like the artwork, don't forget to send your compliments to Vrindaban Das Ji with the form on the "Contact" page.