Replace the sample header images and the other images on your theme with your own images. The header image can be a photo or just a logo and a tagline on a plain background.
To find an image you have the following possibilities:
1. Take a picture
Real-life images create a high visual interest. Users are attracted to images that show real-looking people doing something they are interested in. Let’s say you offer Hawaiian hot stone massages: an image showing you giving a hot stone massage to one of your clients creates much more visual interest than the image of hot stones.
Good image quality is very important for your website. This is why hiring a professional photographer for a shoot can be worthwhile.
If you want to take the pictures yourself take a look at these sites:
2. Search for images
Be aware of copyright infringements when using images on the web. You can search for licence free images or pay for them.
Avoid using obviously stock art images like the famous smiling woman with headset. Try also not to use busy images with poor contrast between the background and too many objects.
Sources for licence free images:
Sources to buy cheap images:
3. Create your own image
If you want to create an image yourself or insert a logo with tagline inside the header image you can use an editing tool like www.pixlr.com/editor.