Leonardo is a good option, with high-quality assets that are consistent in style and fast to generate. It comes with AI models for anime, illustration and photorealism, so it's good for a wide range of creative uses. The service can generate images, edit designs and create 3D textures, and it's good for game assets, fashion and marketing. It's available in free and paid versions, so it's good for a broad range of people.
Another option is ZMO, which offers a range of AI image generation tools, including anime and photorealistic portrait modes. Its interface is designed to be easy to use, and it's got more than 30 anime styles. ZMO also has editing and compositing tools, so you can fine-tune results. It's available in free and premium versions, so you can use it depending on your needs.
If you want something more focused, Artiphoria offers more than 120 visual styles and real-time digital art generation. It's geared for graphic design, social media and advertising, so it's good for automating image generation. It's available in several pricing tiers, and you can try it for 7 days for free. Artiphoria is designed to let artists and designers focus on their creative vision while leaving the technical details to the tool.