Yes- please do!
Images can make an answer much more appealing.
You can add a single image or a whole gallery. See What is fruit? for example.
You must be logged in to upload an image. Only freely licensed images are allowed, so don't grab them from just anywhere!search for other questions to use that same image in. For example, there are lots of questions mentioning polar bears where Image:Polar bear.jpg can be used.
If you only add an image and no text to an un-answered question, the question will remain in the "un-answered questions" category.
Finding free pictures to use Edit
- Flickr. You can use Special:ImportFreeImages to easily import a free image from Flickr. If you want to search Flickr directly, look for ones under a Creative Commons License (not the non-commercial/NC license though). Use this search link to find them.
- Wikimedia Commons - every image on this site is free to use. Just make sure you attribute the source and author when you upload the image to Wikianswers. You can find a search tool for Wikimedia Commons here.
- Public Domain Images Thousands of royalty free photos, public domain images for websites, newspapers, magazines, video and TV productions, and any other use.
- Free Clip Art Now Has over twenty thousand clip-art images and pictures, also in the public domain.
- Besplatne slike Thousands of copyright friendly, public domain images for any personal or/and commercial use, easy navigation, no registration. (Serbian)