I've also favourited this on Furaffinity, and since seeing it yesterday I can't get this out of my head, this is perhaps the most adroit illustration I have seen in some while. I could chalk it up due to my coloured preferences as being an ex-patient, but there is so many elements that come together and take the whole thing a considerable length, making it a really strong piece of composition.

You have the hazy brain-foggy background in its muted splendour has this brightness to shining out against the character giving a very chemical crystalline quality. The Pills a blur but as they're scattered builds the illusion of depth and the jarring off-centreness some retain a three dimensional if I had the appropriate eyewear. The typography strikes me having this sinister Nietzschean motif (specifically his Doctrine of Eternal Recurrance) yet I can stop murmuring it to myself; getting a small uncanny buzz. It fits the four-arms reminiscent of a Bodhisattva, transpiring from the psychiatric imagery; the lotus imbued like a saline solution to be inserted IV. Even the triangle I can vaguely get, being similar to the diagram of Cognitive Behavioural Therapy. Each corner representing THOUGHTS, FEELINGS and BEHAVIOUR. I mentally perceive the Psychological trying to make a picture of his Ego or mental state, but he escapes it becoming Transpersonal. The Illuminati, the third eye, and the different elements in his hand: This all hones in on the theme of Transcendence, I have never seen something conceptualized so beautifully than this.

I really wish I could've seen how you made this, or any of these End Stage Bosses, but this by far is my favourite.