Potential Paths: Path 1: The teacher could use Midjourney AI to generate images from textual descriptions. These images could be highly tailored to their lesson topics and offer students visual representations of concepts. However, Midjourney does not have a built-in museum database for images. Path 2: The teacher could use both Questionwell AI and Pedagogical for their image sourcing and question generating needs. They could use outside resources for museum image databases, like online museum archives and then incorporate these images into Pedagogical and Questionwell to create question sets or quizzes based around these images.

Final Narrative: Based on your query for a digital archive with high-quality searchable images from museums, none of the presented tools provide this exact feature.

Despite this, one way of going about this is by using an external image database from online museum archives. Once you've curated the necessary images, you can use Pedagogical and/or Questionwell AI to incorporate these images into your lesson plans or assessments.

With Pedagogical, you can create quizzes and offer tailored essay feedback, using these museum images as content. Adding these visual aids to complex topics can help improve your students' understanding.

Meanwhile, Questionwell AI can assist in developing diverse question sets based on the images provided. This tool allows you to create questions of various types and align them to your learning objectives.

While these two platforms do not directly fulfil your specific need for a museum image database, they provide valuable resources for utilizing museum images in different forms of assessment in your classroom. For your needs, using an external source for museum images may be your best option.