To add a picture to a slide in a presentation, the best view to use is the Normal view. Here's why:
1. **Normal view** allows you to see the slide you are working on along with a pane for inserting and manipulating images. This makes it convenient to drag and drop pictures onto your slide, adjust their size, position, and apply formatting if needed.
2. **Slide Sorter view** provides an overall view of all the slides in your presentation but may not be the most convenient for adding specific elements like pictures. It's more suitable for organizing and rearranging slides rather than detailed editing.
In summary, for the specific task of adding a picture to a slide, the Normal view is the most suitable as it offers a balance between seeing the slide's content and having tools readily available for image insertion and editing.