Hi Deanna
Crave is built on the Genesis framework. Unfortunately, Crave is an older theme, and is no longer in the StudioPress third-party themes area, and if Pixelista has currently gone fishing, then it will be tough to get customization support for it.
I general, Genesis 2.0 is not designed to take old-school full width header images that include the logo design like your artwork. You may be able to stuff a 2/3 size one in there and then not use the header widget area to the right, but it may be tricky to get it to be properly responsive and/or correct in all browsers.
In Genesis, you upload your header logo through the CUSTOMIZER -- go to Appearance >> Customize and select Header Image. Typically the theme will tell you the maximum recommended size for the logo usually ~ max-width 300px.
Altering the CSS for the site-title, etc. may allow you to stuff in a longer image -- but remember that by default Genesis will not display the site description once you upload a Header Image (which really should be named Logo Image!).
Hope that helps!
Haylie