Maam, kolam is really nice, Do u have any lights just above the kolam as because it gives a little bit dull effect.
I think you are a beginner in this art as you kolam is out of symmetry though the design is good. I really appreciate you wanting to try big kolams but in my opinion I think you must practice smaller kolams first, then try big ones and I am sure you will come out with lovely kolams soon :)