Can I train Midjourney to generate YouTube thumbnails like this? Can I use my pictures as well?

It’s a GTA San Andreas video. The guy used his own photo and added some game context behing submitted by /u/Icy_Preparation395 [link] [comments]

https://www.reddit.com/r/midjourney/comments/1hz8zp6/can_i_train_midjourney_to_generate_youtube/