Again: an image would be very helpful. Or at least a description of how Loomis 'shows' the planes of the head. For your convenience: here is a .pdf file of the book, you can refer to pages (but write down the passages that the people reading your question need to know), and take screenshots using your device to upload them here.

And what is unclear about his description? Also: how is this related to your other question, and could it be that this is a more specific version of your other question?

This question is solely about planes of the head/ how to draw the planes of the head in any angles/ Loomis shows only two angles: front ( still it's tilting right) and side views

And underneath, on page 34 (or 30?) are a lot more examples. And on page 35 in the document I linked.

My problem is those lines of drawing seems unclear , blurry to me , what's the process of drawing these lines of planes !

That's something you'll have to learn, I'm afraid, and not something we can really help you with.

They are decided by the areas of the face that receive the same amount of light from a single light source when lit.

Loomis mentions it himself: "the planes of the head should be memorized".

I would learn easily if those lines were drawn clearly

Start by learning the planes of the face on the upper left side of the page. I suggest drawing these from multiple angles. Then move on to the more detailed set of planes.

I don't see what's unclear about them, though.

They are based on a very general human face, and describe the major shapes of the head.

Humm! That's the problem, to draw from multiple angles

But isn't that what the former part of the book was about? To start with the sphere, and construct the head from any angle using the dividing line existing of three equal parts?

(p. 21 in the linked edition)