Need help with lighting

https://preview.redd.it/a80x7pdy2pdg1.jpg?width=3840&format=pjpg&auto=webp&s=8566730e8ba77fbd5dbb7b9e3c0149138f9a4c29

https://preview.redd.it/xxv9lkey2pdg1.jpg?width=3840&format=pjpg&auto=webp&s=612af4569bca932dd508751c5b70d1e68466802d

I tried fiddeling with the lighting options in photo mode but im not really satisfied with the outcomes. Are there any rules of thumb you should follow concerning using lights or smth? Any help is appreciated.