If you want a tool to turn modern photos into Renaissance-era art, DaVinciFace is a top contender. The software, which uses a generative neural network, can turn photos into beautiful Renaissance-era portraits in a matter of seconds. It's got an intuitive interface and protects your privacy by automatically deleting photos after they're done. You can also pay for high-resolution versions for commercial use.
Another tool worth trying is PortraitArt, an AI-powered service that converts photos into a variety of styles, including oil painting and watercolor. It doesn't specifically offer Renaissance art, but its variety of styles means it's good for people who want to create something more unusual and personal. The service is good for decorating your home or office, for gifts or for turning a moment into something you can keep.
If you want a more general-purpose AI art generation tool, check out OpenArt. It doesn't offer Renaissance art specifically, but it's got a lot of easy-to-use AI drawing tools and editing options. You can create your own styles and models, too, so it's good for artists who want to experiment. The site offers a variety of artistic styles, and several pricing tiers to match your needs.