I started with this photo from Pixabay, which is a source of copyright-free images.

I processed her in iColorama for tone, smoothness, to fix the eyes, and to warp it. I warped her to increase the size of her eyes and forehead, for a more open expression. I used a background from the iColorama background exchange,which you can find here. I think this one was made by Donald Bishop. To blend in the background, I used Effect/Blend Normal mode with a brush mask to protect the figure.

I made this image in iColorama and also the Matter app. You can see how here.

I want to create a mask that is the shape of the girl's face. With the image of the girl open in iColorama, I used Adjust/Exposure and pulled the brightness slider all the way to the left. Then without applying, I reduced the opacity so that I could see what I was doing, and I opened the brush mask bar and painted the shape of the face with a hard round brush. Then I exported the brush mask. This saves the mask as a black and white image.

Now I opened the saved black and white image in iColorama, and I applied Style/Flow to smooth the edges.

I used Effect/Blend to place the smoothed black and white image over the girl, in Normal mode, and used the gray slider to reveal the girl's face.

To create a sense of thickness to this piece of the face, I once again used Effect/Blend and brought in the black and white image, but this time at lower opacity and a slightly different size, again using the gray slider.

I inverted the black and white image using Adjust/Channels preset 6.

Using Effect/Blend, I put the inverted black and white image onto the girl in Normal mode, and under Set I pulled the right end of the gray slider a little to the left to make the white background disappear. I adjusted the rotation slider and resized a bit to get the black hole right where I wanted it.

To create a sense of thickness to the shell of the face, I once again used Effect/Blend and brought in the inverted black and white image, but this time at lower opacity and a slightly smaller size, again using the gray slider to make the white background disappear.

Now I cropped. Then I brought in the "solar system" image in Effect/Blend and used an inverted brush mask to mask out everything but the hole in the head.

I now used Effect/Blend to bring in the piece of the face on the black background that I made earlier. I reduced the opacity to get the image positioned and rotated to where I wanted it, then I increased the opacity back to 100%. I opened the Set sliders and pulled the left end end of the gray slider to the right until the black background mostly disappeared. Before applying, I used a brush mask to clean it up. Then I applied. I then brought the same image of the piece of the face back into Effects/Blend, and using an inverted mask, I painted back some of the details from the eyes that had been lost in the previous blend.

Now I moved the eyeballs so they are looking to the left, so she is maybe wondering what is happening to her head. This involved several blending steps. If you have another image with eyes you can use, that would probably be easier.

I enhanced smoothness, tone and color. To smooth the skin, I used coherence, denoise, glow and blur. The I used sharpen to bring back some definition.

I added some texture in the background, using a painted-in brush mask.

I used Levels, Shadows, and Tone/Duotone for more depth.

At the suggestion of Jerry Jobe, I later created this version where you don't see the edges of the piece of the face. I like this better. His reasoning is that since we see the beveled edges of the head shell, showing the inside of the head, then the viewer would not see the similar edges of the face piece, since they would be hidden due to the angle of view. Removing those edges involved blending the image with an image from an earlier step, which showed the empty head and the solar system inside (no face piece). Then I used an inverted mask to paint out the unwanted edges.

Here is another version where I first created a negative form of the piece of face using the sixth preset under Adjust/Channels. In Effect/Blend, I brought this negative image in, and I painted on a brush mask to replace only the insides of the head. Keeping the mask in place, I then altered the colors using Tone/Tint.

And here is a version without the face-part edges.