In your wireframe the searchbar looks really small. As I know that this might not be the fixed styling for your app I want to encourage you to use the space that you have in your app
I do not understand why "Header colour changes from orange to green" is a criterion. You should describe from a user perspective why you want to mention this
otherwise you should describe the process of searching for a album
I hope this does help. Feel free to ask if you have questions. :)
Value proposition
As a User I want to see a SearchBar in order to search albums
Description
Acceptance criteria
Tasks