Over the years I've come to realise that having a consistent process in illustration makes every project so much easier. One of the main contributing factors to that consistency is having an organised, clean studio. I've spoken to many illustrators and artists over the years that say they can't start working until they have a clean space to work.
For me, having a clean, organised space not only helps my process, but also my headspace. An organised studio makes me feel like I've organised my thoughts. This isn't to say my workspace never gets messy, I think you have to get messy sometimes, especially in the heat of creativity! My studio usually looks like a bomb has hit it by the end of the day, but if you take some time to sort it all out when you're done, you'll be rewarded with a space that's easy and enjoyable to work in.