The plaid oval is meant to be an "O", thus the name is "Our L'lass."
Searching for the correct name turns up this google books hit from Osprey's book on Korean war B-29s:
http://books.google.com/books?id=Q_eBOj ... CDEQ6AEwAASo it's 44-61951 of 91st SRS.
Other informative links on this plane (search for 61951 to find it in the lists):
http://books.google.com/books?id=5SdDW6 ... ss&f=falsehttp://home.comcast.net/~b29sinthekorea ... erList.htmThe nose art is great. If you can wrench your eyes over to the front end of the painting, you'll see the girl is holding a camera, a clue that this is a photorecon B-29. The camera resembles an Argus model that I own which is about the right vintage.
HTH.
August