Nine Character Photo Collage Merge

Attach the file you just attached in a 3*3 format to make it a horizontal file. After merging, resize the long side to {argument name="Long Side Pixel" default="1400"} pixels while maintaining the ratio. Set the image quality to 100% (maximum quality) and output as jpg. 

In the background of the first attached image ({argument name="background" default="Living room"}), the nine characters from the second attached image (character sheet) are each sitting on a sofa in the living room, looking at photos hanging on the wall, picking up books, or chatting on the floor, spending a peaceful time together.