I need a graphic designer to help edit and create images

Information for the business: A trivia application game
Industry: Entertainment
Design details: We recently released an application and there is a number of things related to the application we need help with, such as:

1) editting and improving the sponsor images within the app.
2) Creating a banner image for the app that will be on our application landing page
3) Photoshopping images to be used in the sponsorship proposal documents.
4) Various design work that will be shared as work progresses

The landing page of the app is : www.kwizyapp.com ... The content is not filled out yet but what will need to be done is images/screen shots taken from the app and edited accordingly to fill the mobile phones. Also, the first banner image you see will be required. Information for this will be shared if you are selected for the job

Furthermore, images from the app will need to be photoshopped to show how brand logos can be incorporated. The app can be downloaded from the appstore and google play. Just search for "KWIZY"

We will be requiring further work related to this in the future so consider making a long term arrangement that would be mutually beneficial.
Ideas for the visual style: elegant and clean
Where the design will be used: applications, sponsorship documents, app landing page
Extra notes: More information will be shared.