I select these colours with the help of other houzzer and expert professional advice and discussion. I also got help from colour paint catalogue. Is it looking good or not? Is there any problem with these colours and their combination. Please guide me in this regard.

mostly Indians uses brown varnish paints for their main wooden doors....I even don't know why they didn't use other colors...even in my house doors are given brown color wooden texture...

Also, I would like more counter space. What size of the sinks should I get? 18 inch? Thank you.

Always go for timeless colour combinations like beige, brown, grey, white or other muted earthy Color tones and shades. But make sure even you are making a combination of 2-3 colors they all have to be in ratio of 60:30:10 or 60:40. What materials do you use also matters a lot. Some people opt for aluminium composite panelling , some for stone or tile and some for even stainless steel. These all are the best choices but to make your home look modern and contemporary it has to be grey or beige no matter what you choose. And for more traditional homes go for stones, wall paints and even textured paint.