Design an App

Hi! I am planning on making an app. The app is sort of a mix of Snapchat and Tinder. I have drawn sketches, on data, of every slide. I only need a designer to make my sketches much more professional. The app contains 27 sketches, but many of the sketches look almost exactly the same, but with maybe an additional symbol or typing. I have to see what you are capable to do. Therefor I would like you to provide me a sample before I would award you the project. If the suggestion is good I will pay for the sketch you made, and if the suggestion is real good I will hire you to do the whole job. First of all I would like you to see one of the sketches that I have made of the app. (please see all attachments) The app is for the age group 10 to 60 and for both female and male. I would like to see your suggestions when it comes to design, but must importantly color combination that fits the age group 10-60 and both male and female. I am looking for a “modern design / gradient design” I want you to design the tool bar (the silver bar on top of the picture), the color combination threw out the whole slide. And a new design for the thumbs up and thumbs down. I simply want to hire the right person as quickly as possible. You do not need to spend a lot of time on this particular task. I just want to see if we are on the same page