I am freelance copywriter, but sadly I am not very good creating graphics. The truth is that you can browse the internet and get some images that are free and which rights only ask to put a link to the owner. This is easy and cheap.
However, some clients want a more comprehensive work and are open to pay for someone to create the images that will be published in their content. In these cases, you can just say ‘no, I am not able to provide original images’ or you can cooperate with graphic designer freelance and offer the full pack.
Well cooperation has one disadvantage, if one of the worker fails, the two of them will be affected. If you commit to collaborate with someone you commit to have a post and an image ready for the deadline. You can’t come to your client and say ‘man, it was the other freelancer who fails, I did my part of the job’ because someone that is paying, doesn’t want problems, but solutions.
However, if you find someone reliable and hard-worker, you are in disposition to offer a work that has its value increased.
My experience says that most clients just want a text, and the ones that ask for an image have the nonsense idea that it will cost the same as just a text. Well that is not possible. An image is very important for content, and you can’t just get the first one and hand it in.
Happily there are also a lot of people that like things well done, and understand the work that an image requires. In these cases, have some freelancers colleagues that are able to do it, is a great plus of value.