• youtube playlist of useful art videos
• personal pinterest board for art references
• anatomytool.org
  • has some sweet 3d models of anatomical things
  • i love using this for skeletal structure studies
• line-of-action.com
  • tons of references + offers some fantastic art exercises that are good if you find difficulty committing to practice
• Winged Canvas on YouTube
  • I cannot recommend this channel enough for art tutorials! their stuff is well-explained & can apply to a variety of art styles
• Art Rocket
  • Tons of amazing tutorials on pretty much everything - the site is intended for people who use CSP but most tips are general enough to be applied with other programs
• JookpubStock
  • One of the best reference sites I've ever visited. Photo references are sorted by specific topics, and it even has a pose/reference section dedicated for use in character sheets

Specific articles I found helpful -

• Some basics about learning anatomy
• Good article on form
• Guide to creating colour schemes

General compiled tips -

• Study from life or 3d models if possible - it grants a deeper understanding about the form of your subject. There's really something great about being able to rotate something...
• Gesture is just as important as anatomy! combine your knowledge of the two, using only anatomy may make things look too stiff.
• It's not necessary to draw every day, especially if it stresses you out too much. find a schedule that works for you. 4 times a week is what I personally strive for