You can easily add images to category/product descriptions.
To add an image to the description of a category or a product, follow the steps below:
In your store's Admin area, open the details page of a product or category you want to edit.
Locate the "Description" field in the "Info" tab of the details page and click the "Insert image" icon.
You will see a popup window.
Select a source for your image and follow the flow. You can use one of the three ways for this purpose:
Upload an image from your computer;
Insert an image by URL;
Browse for an existing image.
Click "OK" (or a similar button) to insert the image into the description.
If you need to edit the new image, click on it and use the toolbar above:
Click the "Update" button to save the latest details.
Now, if you check the storefront, you should see the image you have added as part of the product or category description.