I will be dumping here some nice tutorials for you guys to enjoy and practice/get inspired by.

Pinterest - just scroll down forever, best thing about pinterest is that it finds you more and more related results endlessly. Advice: make a free account in order to browse freely + pin your interests so that every time you visit Pinterest it will show you great artworks related to your criteria and do the searching for you. Best thing? Everything is credited and sourced. Most of the time.

Dog vs Cat tutorials

Lion face tutorial

Lion anatomy study

Lion movement muscle study

Canine paw studies

Wing tutorial

Human hand tutorial

If there's something you can't find on Pinterest (unlikely!) you can always request it in the comments so I can browse more options for you!