If you're looking for something besides PortraitArt, there are plenty of AI-powered art generation tools that offer a lot of creative options.
Another good option is OpenArt, which turns text-to-image prompts into pretty pictures. It's got advanced AI drawing tools, boundary-free AI drawing and multiple artistic styles. You can even train your own models to create art to your taste, which is why it's a good option for serious artistic exploration.
If you want something more open-source and community maintained, Picture it is a good option. It uses stable diffusion models that can generate and edit images quickly. It's got guided drawing input, outpainting and inpainting abilities, too, so it's good for digital artists and designers who want some control over their art.