Milind,
I love this image - the concept is very creative and you did a great job of matching the light direction. The pose is perfect and the crop including a bit of the arm is just right. Good choice of a model for this as she has a lovely profile.
I do agree with the idea that she needs to be a different size in proportion to the sky elements - either larger or smaller to prevent the eye from bouncing back and forth between the sky elements and the subject. tried it out with the sky elements smaller and the stars sprinkled out a bit more, hoping that the viewer's eye would move a bit and then rest on the subject.
I did a quick example by reducing the size of the sky elements and then adding a blank layer on top where I used a soft, round brush at varying sizes and opacities and just added some stars. I blurred (Gaussian) the star layer a little bit.
