Logos, product concepts and mascot or character (games, animations, etc) are all things Illustrators can help you with.
Scamps, sketches or high-spec drawings are sometimes the only way to express an idea or tell a story. For example, it's hard to imagine a property developer selling their development without first creating an illustration showing how it impacts the local area.
Illustration is typically something a skill that's needed for a very specific output. In other words, it's an ad-hoc requirement.
The best way to hire an illustrator on demand is using remote freelancers. The sorts of illustration project you can outsource are:
When you find the right person for the job, whether it’s a full
time employee or a freelancer, you want to hold on to them. Finding
the perfect fit for your project can take time but when it clicks it’s great.
Find out how to use them again and again.