Dear Sir or Madam,
 
  I am a professional graphic designer, illustrator and colorist graduated from Graphic Design Department of Fine Arts Faculty. I have got my own creative boutique office and also work as a freelance artist for abroad. I have the qualifications that you need. 

Great product you have, love the idea behide it. I will start submitting some designs asap.

Hi,
nice to meet you. We''re very much  looking forward to receiving your submission.

Regards.

Hi,
nice to meet you. We''re very much  looking forward to receiving your submission.

Regards.

Hello,

Thank you for the participation payment. That was quite a surprise. I''m happy you liked it. :)
Good luck!

Regards,
Cristina.