Roof line design help needed

[Jenifer VonDracek]

Hi all- I just started a new project and I'm looking for someone that can help point me in the right direction. Here's a brief description of what I'm working with.

It's a single level home with what appears to be an addition off of the back. The addition has a foundation and 2x4 framed walls. It appears that when they finished this space they ran beams from the existing home to the back wall and created a very shallow pitch roof, resulting in a low interior ceiling height for that whole back section of the home (highlighted in yellow). What I'd like to do is essentially reframe the roof of that entire addition to give it more interior headroom (ideally vaulted in that portion). I'm having a hard time coming up with a roofline design for this that will still feel cohesive. Any advice would be appreciated including a referral for someone I can hire to help design this for me. 

Jen