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 portfolio https://www.freelancer.com/u/webpolis.html
to see some of the icons i made, in order to evaluate my work.
I can send you more samples, if you want to.
I use Adobe Illustrator for this kind of projects, i can deliver you the icons as vector format, and also saved as any other digital 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 21 originals, clear and modern icons.
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,
Lili.