I would like to share these very helpful design diagrams and look at some in-depth together. If ever you feel stuck or have design questions, these are really good to have handy. I don't think they are ALL great. I recommend researching more in depth the subjects of interest or concern, e.g. color psychology is huge and cannot be summed up in a simple diagram.
For example, it might make sense to hang curtains at window frame height. Although hanging them at ceiling height instantly makes the space seem larger and more open by forcing the eye to look up and around.
Here are my favorites that I think you should pay special attention to:
I will be posting a blog in regards to color psychology very shortly. Color psychology is fun and easy; I look at it as a science.
Hopefully you will share the same enthusiasm!