1st movie clip!

I am so please that I have managed to create a 2 minute video after just a week or so, totally new to Comphy and AI stuff. I built a workflow, included a lora and negative/positive promts. The movie is really simple with 2 people just walking side by side then sitting on a bench. However, as the movie progresses the faces have changed clip by clip and the final 2 character look nothing like the first 2.. which is weird. After a bit of research it seems I would need to create my own lora which I can’t do right now due to my GPU having only 8GB VRAM So, are there any known Lora’s, creation tips that I could use to help this please? I was wondering if inpainting the last frame for each clip would be the right approach ? Many thanks in advance