x2 what Dytecture said, this is not enough to go on. Most important thing before you do anything, is you need to know lot restrictions in that area and what are the zoning requirements, i.e. side, rear,front, set-backs. In addition the size of your house will also depend on the total percentage of a lot that can be covered by impervious surfaces (structures, decks, and surfaces likes asphalt or concrete driveways etc, which reduce natural infiltration, etc and after you obtain that information, only then you can contact a local Architect and you can roughly come up with the size of your house and layout on the lot... until that, the information you get here it will be useless to you in your case and a waste of time for everyone else. With that said, 40x104 is not a confirming lot for most of the area around here and you will need variances because confirming lot sizes usually start at 50x100, unless you in a section where ordinances permit residential cluster development. Good luck.

Modern houses like yours tend to be painted neutral colors. I'd go for white or off white with trim in different colors. I'd probably accentuate the horizontals, painting your porch railings a contrasting color. You can go to a website like SherwinWilliams, up load a better picture of your house and play around with color ideas. https://www.houzz.com/photos/texas-residence-contemporary-exterior-dallas-phvw-vp~1994082-Residence-contemporary-exterior-dallas https://www.houzz.com/photos/san-clemente-california-home-contemporary-exterior-orange-county-phvw-vp~2456325-CLEMENTE-California-Home-contemporary-exterior-orange-county https://www.houzz.com/photos/oakland-hills-residence-contemporary-exterior-san-francisco-phvw-vp~52742-Hills-Residence-contemporary-other-metro

Need help to make elevation design for the front of the house.

Hi Pardeep Phour if you are looking for an interior designer or decorator you can search the Houzz India directory: Find professionals - you can refine your search by type of professional and location. Hope this helps, Vasundhara (Houzz Team India)