I only follow a few people and orgs on Flickr and this is one of them. I love looking at illustration, watercolors, and drawings, especially of the natural world. The Biodiversity Heritage Library is a wonderful, huge resource that blends science and art. Take a look at the library albums.
From the library’s about section:
Inspiring discovery through free access to biodiversity knowledge.
The Biodiversity Heritage Library improves research methodology by collaboratively making biodiversity literature openly available to the world as part of a global biodiversity community.
The @BioDivLibrary Flickr collection is specially curated by book, subject, and contributor to make it easier for you to find images related to specific research needs. Learn how to search our Flickr for specific species or subjects.