To insert an in-cell picture saved on your device, from Microsoft's gallery, or imported through the web images search, first ...
You can add a signature to a Microsoft Word document in several ways, depending on the computer you're using.
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.
You can draw freely on Microsoft Word using the "Draw" feature whether you have Word for Mac or Windows.