I can advise you on where to look for information on how to merge images in Photoshop. This is, by the way, much easy than you may imagine, and you can find all the details right here: https://skylum.com/blog/best-instagram-editing-apps . I hope you found this information useful and that you will be able to complete it on your own.
@BlackSpigot.comI am reaching you about support for the Unity/VrChat Section of BlackSpigot.com. Please open a conversation with me I will send my discord. I need more file space in order to upload models, witch is what people want.