need graphic designers for social media posters

I am looking for talented and creative graphic designers to help me create attractive social media posters to promote my business. The focus of the project is to design posters for the Instagram platform, however posters for Facebook and Twitter may also be requested. I'm open to the creative ideas of the designers I hire, so there are no specific elements or themes in mind at this time. The quantity of posters requested is more than 7, with the potential for ongoing work. Those interested should be passionate and knowledgeable about design principles, and have a portfolio of work showcasing their style and design ability.