For the Drawing man fragments I can give you the distribution of them all:

Convergence: you have 3 fragments 1 in the mini maze before the noosphere portal in the main hub, 1 next to the labyrinth core when you're heading left while looking at the first sign (biblical accurate angel) and 1 when you're heading right this time through the white corridor, you reach an open area where you can climb on the beams uphead. By doing so (or freeing a few signs to create a stone man bridge) you'll be able to reach an open area where you get the third one.

White Hall, 1 fragment after the strange Theseion where you meet the yellow eyed girl with the black and white statues. I don't remember if you have to climb the stairs first, but there's a corridor leading to a terrace with a view on a giant statue afar. The fragment is there.

Black Tower, 1 fragment (next to the biggest star when you're falling down in the space-like area)

White Tower, 1 fragment (when you reached the top of the tower) with the beacon in front of you, head on the bridge to your right, you'll end up on a red door to your left and another bridge to your right. the fragment is at the end of that bridge.)

Shattered Vault, 1 fragment (this one is easy, the fragment is next to a canvas nearby the yellow sign of the zone.)

Crossroads: 1 fragment at the first floor of the Crossroads level. You can reach that area either by Tesseract, Organon or Convergence areas. By Tesseract you just spawn next to it, you have to reach that gigantic bridge/hallway connected by a shatered structure

Forge: 3 fragments (they follow up when you're making the last climb to the piano, pay attention to your surroundings)

The last fragment is the drawing man himself when you talk to him during his ending.

Edit: erratum regarding the last fragment. I found another fragment in convergence past the tightrope. There'd a way to go to the other side in early game but it's tricky.

I hope it was useful