I wish to have a cat like that one. Really nice work author.

I think there should be no light effect on the balloon but around the balloon. Because you are facing the sun, so there should be a lights coming out from the behind of the balloon. May be it is a rays of light and it stretched out (but it should be very thin because it is a sunset). and there should be a small diffuse light on the lower right of the balloon because it face the sun and also to give it a 3d sphere shape. I also think that texts were write on the balloon, so it would be round like a balloon, so you can use a warp tool to do so.

So so much love it .....