I have studied the teachings, upon which these images are based (provided by that Teacher), for ~17 years. I have meditated, and I have experienced the Service Aspect wherein we put into practice all that we have learned.
And while my understanding is far from complete, and often a bit leaning on the side of over-intellectualism, I still think that these charts are useful, as they were provided to help us understand what is taking place between Soul and personality, as the process of at-one-ment is carried forth.
One's effort, and interest, in the esoteric path usually begins with study. Whatever devotion, and the more emotional side of aspiration, that is in the disciple (a probationary chela, a `student') ... will lead him or her to look further within, to press on beyond the outer husks, and to penetrate closer to the heart of the Mysteries.
In this search, I think we all find that there is much more to the esoteric path than any set of teachings will provide. Even if one finds that HPB's writings are a suitable "textbook" (or study course) for the time being, we cannot for long deceive ourselves and believe that the wisdom has somehow been translated, and reduced to a few words (or even long treatises) on the printed page. This desire to make a paper pope out of the Gupta Vidya must be overcome.
DK's chart regarding Meditation must thus be taken with a grain of salt, as also those showing the relationships between the various force centres (chakras) and the Solar Lotus (the 12-petalled Sahasrara, or `Heart within the Head' - the esoteric heart center, with its correspondence to the Anahata, or exoteric heart center).
Again and again, DK stresses that to understand the Soul in terms of the Solar Lotus, hovering above the head of the student, is to concretize and conceptualize that which is essentially beyond these forms of materiality and concrete thought. The Soul Itself actually exists within, or upon, the plane of Higher Mind ... yet even to say such a thing, and to draw lines on a chart, with a "pretty flower" (I will try to anticipate your most astute observations here, Francis) - is to REIFY an inner relationship, and state of things which is really still beyond our understanding.
Not that some mystics, and esotericists (certainly those who have been very gifted and carefully trained clairvoyants), haven't actually observedthe realities which are here being conveyed in chart form. But even when they do observe the Soul, it is always stated that there is NO HOPE of fully communicating the vision, whether that has been the Soul as a Being, or in terms of the "form-side," including the structure of the Solar Lotus in the Causal Body (Karana Sarira, eh Francis?).
So, the charts only go so far. They are hard to read, in terms of some of the small notation, except in print ... and perhaps that is fine. The set of relationships, and correspondences, both between the various centers of all the bodies, as well as between the centers, the petals of the Solar Lotus, and the central JEWEL contained therein (the Monad, the Spark - of blue, Electrical, `Cosmic Fire') ... is something I find quite fascinating.
What more can I make of it, after all, except
what I bring to it from my own experiences and insights? 
But when once we start to begin to MAYBE parse a few things together ...
eg, OM MANI PADME HUM (Om! The Jewel is in the Lotus!) - Hmmmm ...
- ah well, the `Aha!' is unforgettable, and I truly think we are forever changed, for it.
Master M. says, "Read less, meditate more." And they all seem to say, SERVICE is what we're really here for. Even meditation, as a form of Service, is sometimes not the Dharma for which we are called, in a given moment, or phase of life. All three, seem vital for spiritual progress.
NAMASKAR
Oh, and FYI, if you want the symbolism, and esoteric meaning, regarding some of the coloring of the Solar Lotus in the third chart ... you'll just have to read `A Treatise on Cosmic Fire' (or as much of the 1283 pages that moves you 
). It was provided as the
"psychological and symbolic key" to HPB's `Secret Doctrine.'