reply

I got a reply from the publishing department at the Natural History museum, I asked about what age group I should be focusing on and how in-depth the information should be:

She was very clear about how it needs to be scientifically correct - if I am to convey the book as educational it needs to be giving the right information, so I need to make sure my research is from reliable sources and that my drawings aren't too abstract. I might email the scientific department once I've done my research to check my facts.