• Inspirational Illustrator Sites with Tutorials
• Jason Hoppe
• Jason Hoppe Spiral step-by-step tutorial
• 
• Become a master of isometric illustrations-3D effect - EXCELLENT
• Von Glitschka: Illustrator Master. Check out his YouTube Tutorials
• Von Glitschka on Instagram
• Everything Von Glitschka
• Astute Graphics: Great Illustrator plug-ins
• Watch Paul Trani, Senior Adobe Evangelist in his online stream,
  "No-Nonsense Tips in Illustrator. I watch everything he puts on the web.
• Von Glitschka's Monster Drawing Course