srvigneshwaran They look good so far! Some feedback for you:
The current trend in 3d is to give the objects a slightly softer look. You can achieve this with changing the shading to have softer highlights. Also the lighting can be improved by adding more light sources that simulates ambient lighting. There are some renders that allows you to bounce light around on surfaces giving the objects a more natural look.
One thing to be aware of if how well the different objects are separated visually. For example inside the ribbon you have layers that end up being red on red:
You can compare this to the inside of the sleeve here. It's clear that the inside is a lot darker than the outside:
A similar problem happens with the snowman where it's white on white:
You can learn a lot from Disney/Pixar. Here's a rendering of Olaf from Frozen:
As you can see the parts of Olaf are clearly separated.
Please post new versions - we are happy to give you feedback on work in progress!
Good luck on the 3d adventure.