UI UX design Windows Desktop app

We are looking for a UI/UX designer to assist in designing a Windows Desktop app.
The Project
The Main application consists of a Dashboard page, Datagrid page and a few settings pages.
We have a company branding document, I would like the app to be an extension of the current brand.
We have wireframe mockups of each UI page. These will be provided to the designer.

I would like the UI UX designer to provide options on how best to;
1. display data
2 navigate the app
3 Style and look and feel

At the end of the project I need images of each UI page, I will send these to the WPF developer to build the app.

This design work will be completed at your hourly rate.
I will need you to provide an estimate of billable hours to create 3 or 4 design options for the UI.
Then an estimate to develop these further into the final UI design.