I am a big fan of all kinds of nature books and they are of great inspiration to me.
I thought it would be nice to share a selection. (No spon by the way.)

Wonderlijcke Veranderinghen

Author: Johan Haringsma
Language: Dutch

With beautiful drawings by Johannes Goedaert and a lot of super crisp macro photos too. Goedaert was at the origin of entomology and his research and drawings were of great value to his field.

Botanical Illustration Course

Author: Rosie Martin & Meriel Thurstan
Language: English

Perfect book for beginners with clear explanation and exercizes. From basics to really detailed and realistic drawing.

Bouwers

Illustrator: Steffie Padmos
Language: Dutch

With beautiful illustrations and a cool topic: builders.

De grote natuurgids

Author: Jan Toman
Language: Dutch

Eieren en hun vogels

Author: Johan Haringsma
Language: Dutch

Het grote bomenboek

Illustrator: Piotr Socha
Language: Dutch

Mijn grote natuurboek

Author: Marit Claride
Illustrator: John Shackell
Language: Dutch

De schoolplaat

Illustrator: M.A. Koekkoek
Language: Dutch