I'll try to give a solution.
The first point is not an answer, but a question: where's the man face? I read your question several times thinking that I did not understand it well, looking for the head of a man, but I still find it difficult to recognize it. Is this one?
Figure–ground organization is a type of perceptual grouping which is a vital necessity for recognizing objects through vision. In Gestalt psychology it is known as identifying a figure from the background.
Ok, if this is quite difficult to see it, used as a frame for an illustration, it will be totally imperceptible. You are trying a double reading that doesn't work. In your case the ground is above the frame, in both versions, positive and negative. And the single image in negative doesn't work at all.
I think you should work on the profile of the image to reduce the noise and transform it in an frame. At the point where it is now, used as a frame, it is just that, noise around the illustration.
Printing over a color t-shirt is different than over a paper, you need another ink, the white. To obtain the image of your illustration on a black textile, first there must be a white ink layer. Knowing this, a recurring solution is to make the white layer exceed the illustration by forming a second frame outside the image: