Graphic designer to support the generation of web content

I am looking for a graphic designer that can generate graphic content on a monthly basis for a Facebook Page. This is more of a long term relationship. I'll provide branding elements (logo, colour scheme) as well as creativity and you will display it in an attractive manner so that it is shared on one of our Facebook Pages.

I am thinking of a weekly execution, and the ability to speak Spanish to understand the copy is a plus, although not compulsory as a translation to English will be given if you don't speak the language. You should be familiarise with the different formats for social media channels.

Every now and then extra material will be required, and it would be good to work with someone that already knows the look and feel of the brand, instead of explaining since the beginning.