Design for one story house - initial sketch done, only need to re-design roof and windows

I am looking for a designer to help with the redesign of the roof and windows of my one story house. I have an initial sketch completed, but need some help making changes to the roof and windows to create the perfect look. My preferred style for these features is modern, and I do have specific measurements for them. In addition, I am hoping for some additional design features for the roof and windows. Please let me know if you can help with this project!