Hello. I have tested in nano banana pro paid and tell you that you can create more size images.
I tested uploading a first image of the character that you want to put on the table (I suggested that you create an image of the character on full body photo and in the beach with the boxers of the color you want or clothing) and on the second the image of a table on a morgue ( provided in the last pic of this first row of images) Here is the results.
I have used this prompt to generate the combined images.
Put the man in image one on the image two. Cinematic full-body shot from a low-angle ground perspective, looking up from the feet towards the head,the man is lying supine on a stainless steel autopsy table. The subject is with his eyes closed, expression neutral. The lighting is harsh, high-contrast overhead clinical fluorescent, creating deep shadows and sharp specular highlights on the skin and the metallic table surface. Background features a sterile forensic laboratory with white ceramic tiled walls, blurred medical carts, and industrial equipment in soft bokeh. Hyper-realistic skin textures with visible pores, fine hairs, and natural subsurface scattering. Shot on Nikon Z9, 35mm lens, f/5.6, ISO 100, 8k resolution, documentary photography style, sharp focus on the torso. --ar 16:9 --style raw --v 6.0
I have created another style of images using another image (Provided in the last pic of this second row) Using the same technique, uploading the character in the beach at fisrt image and the second one the provided image. Here is the results of these ones.
I have used this prompt to generate the combined images.
Put the man in image one on the image two lying supine on a stainless steel autopsy table. His eyes are closed, expression neutral. The lighting is harsh, high-contrast overhead clinical fluorescent, creating deep shadows and sharp specular highlights on the skin and the metallic table surface. Background features a sterile forensic laboratory with white ceramic tiled walls, blurred medical carts, and industrial equipment in soft bokeh. Hyper-realistic skin textures with visible pores, fine hairs, and natural subsurface scattering. Shot on Nikon Z9, 35mm lens, f/5.6, ISO 100, 8k resolution, documentary photography style, sharp focus on the torso. --ar 16:9 --style raw --v 6.0
You can give a try if you use the prompt and techniques along with the provided pics of the empty tables on the morgue to put your character in it.