I'm not commenting on Shiny as an actress. I feel she is a wonderful actress as proved in her previous shows but I think she looks a little young to play Dhara.
She doesn't look like a motherly figure to the trio but at most an elder sister. Also, all the DILs of the Pandya family looks the same age now. An older actress would have better suited for the role.
Yet again I'll say these are my personal opinions and I don't mean to offend anyone