(below) is likely to be ThyagaRaj. The hair, particularly the waves and curls, and the cheekbone line seem to fit this. ArulRaj was in Malaya in '48 and his hair is flatter by comparison.
Kodaikanal painter2 (below) is definitely not family.
Apparently the style and skill is same of the same school suggesting he might have been a friend visiting.
These are two great photographs showing artists at work in 1949 and what fantastic views. I am very grateful to Robert for letting me add his photos to my blog. It is possible one of the views is of "Coaker's Walk".