To insert an in-cell picture saved on your device, from Microsoft's gallery, or imported through the web images search, first ...

To manually crop a picture in Microsoft Word, Excel, or PowerPoint, select it, and in the Picture Format tab on the ribbon, click the top half of the split "Crop" button.

Microsoft Excel allows you to insert images into a comment. This makes allows one to make a comment more insightful, especially, when they need to explain formulas or describe something meaningful.