just some pointers for returning artists/blogs!
don't feel like you have to "art dump" the work you've made while you've been gone. post your art separately and schedule it! increase that visibility! let all your work be appreciated!
tumblr high-traffic times are the evenings, while twitter's were mornings. keep that in mind for posting, no matter your timezone!
tags are your best friends. use general tags (#artists on tumblr, #illustration, any media/character names for fanworks, descriptive terms for original work like "cat" and "kitten" for your pet's portrait, etc). keep your most important tags in the first five!
maybe even include a tag directory on your blog!
seriously, work I made a decade ago still gets notes because of tags
reblog your own work as often as you like! please do, it helps with visibility and there's no limit to how often you can
most importantly, have fun, be kind, and support other artists!!!