Just because it doesn't include things like 'do it only in WBTB',
Without that "tiny detail" all you will keep getting is sleep paralysis, you will never be able to enter a dream, because it wont get formed properly.

Who knows how many people tried following the picture and never had a lucid dream BECAUSE of it. Some maybe even lost hope.
Boo to the picture maker - he probably only needed some facebook likes.