Hello,
my name is Liliana, i have more than 10 years of experience as a designer, and what i like most is illustrate, that's why i like this project.
Please, check my Freelancer portfolio to see some of the designs i made for apps, in order to evaluate my work.
I can send you more samples, if you want to.
I use Illustrator for this kind of projects, i can deliver you the originals as vector format, and also saved as any other format you may need,
like JPG, or transparent PNG, for example.
I found this project really enjoyable and interesting, and i would like to create an original and functional mockup for your app based on your sketches, not only visually apealing, also clear and easy to use, with originals icons and graphics.
I hope that we can work together, please, contact me if you have any questions, or if you want to see some more of my work.
Best regards.
Lili.