Beginner

Here is a very good tutorial on how to texture pbr materials

Blender material nodes explained by Daniel Kraft

Ghibli Style anime

If you want to make anime in Blender you can.  Other Styles are Pencil, Realistic, Cartoony, Claymation.

A history of Ghibli Style Animation, Where he got inspiration, his process.   I Loved his earlier movies like Laputa and Nausica.

Character design in blender These Videos show how to make a character

Blender has a video describing how to make a stylized character.  Beginner to expert concepts. 

Sometimes you just need a little inspiration, some places to find this:

ArtStation.com

Deviantart.com

Google images Use keywords such as Concept art, or Blender art, cg art, Spaceships etc.

Bing Images Use keywords such as Concept art, or Blender art, cg art, Spaceships etc.

You can get blender at www.blender.org

Composition Tips

Project tutorials -  these are the tuts that yield an asset when you're done - from asteroids to medieval towns.

Beginner

 How to Create a Low Poly Tree in 1 Minute -- Uses some of the ideas in the above link.  Watch the above link first Then make a tree using this method.