Microsoft Word 2013 includes several features that make it easy to manipulate images in a document. Images that you insert into a document are arranged in layers. Each new image you add is placed in a layer above the last one. To put one picture on top of another, put the two pictures in a new Word document. After you have them arranged exactly the way you want them, simply copy and paste them into your working document.
Open a new, blank Word document. If you already have a document open, just press "Ctrl-N" to open a second document. Click the "Insert" menu and select "Pictures" to add an image from your computer, or "Online Pictures" to add one from the Internet. Select the bottom picture first. The second picture will be in a layer above the first picture.
Click the "Layout Options" button that appears beside each picture and select the "Behind Text" icon. This allows you to place the images wherever you wish on the page, including on top of each other.
Drag the second image you placed in the document over the first image. If you accidentally inserted the pictures in the wrong order, you can always put the bottom image on top by cutting and pasting it. Just select the image, press "Ctrl-X" and "Ctrl-V" to cut and paste it.
Click the top image, then press the "Shift" key and click the bottom image to select both. Right-click either image, select "Group" from the drop-down menu and select "Group" again.
Copy the grouped images by pressing "Ctrl-C." Open the document where you want to use the pictures and press "Ctrl-V" to paste them into that document.