Another top pick is AI Gallery, which lets you convert photos into unique creations with a wealth of options to fine tune the art generation process. That includes generation prompts, advanced settings and post-processing options, so it's very flexible and easy to use.
If you need something fast and cheap, Imajinn offers a service to turn your photos into art. It can be used for things like children's books and product photo visualization, and you don't need to know much about graphic design. The generated images are in the public domain, so you don't have to worry about privacy.
Last, Artimator is a free AI art generator that can convert your images into multiple art styles and generate hyper-detailed images. It uses Stable Diffusion models to generate images in different styles, and you can download high-resolution versions, too, so it's good for beginners and experts.