Provide a clear example of a similar job you have done in the past.
I can't attach samples on my proposal, but there's an area on my portfolio with the icons i made for apps and web, you can see many samples there, and i can send you more if you need it:
https://www.freelancer.com/u/webpolis.html
Proposal:
Hello,
my name is Liliana, i have over ten years of experience as a designer, and what i like most is to illustrate, that's why i like this project.
Please, visit my Freelancer portfolios https://www.freelancer.com/u/webpolis.html
to see some of the icons 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 illustrations as vector format, and
saved as any other format you may need for apps, like transparent PNG, for example.
I found this project really enjoyable and interesting, and i would like to create originals, clear and modern icons, that match with the style of your app.
Hope we can work together, please, contact me if you want to talk about the project, or if you want to see some more of my work.
Best regards.
Lili.