Hello, it is a pleasure to meet you. My name is Daniel and I'm an illustrator, I'm dedicated to design characters from comics and cartoons in different styles. You can see part of my art work in my freelancer profile.
I could work the way you want, I can send sketches with a watermark so you can evaluate the progress. At the end of the illustration and be approved, you would send me the payment by paypal and once I verify it in my account I will send the files in high resolution.
In case you like my style of art you can write me to chat to talk more about this style of illustration you want, I say goodbye, greetings!