Accessibility is a cool angle to consider. If you're making this for someone with vision challenges, a free tool that lets you add alt-text descriptions to your photos is key. Microsoft Word's save as PDF feature actually retains some alt-text data. Write your story, insert pictures, right-click each image to add a description, then export as PDF.
That way, a screen reader can narrate both your story and describe the photos. Making your personal storybook inclusive from the start is a beautiful thing. It adds an extra layer of thoughtfulness to your project.