The HTC 8S comes with a 5MP camera on the back. There's no front facing camera, so video calls, webcam and checking yourself out on the bus are all off the table.
5 megapixels is pretty standard for a mid range handset, though some way behind the 8 megapixel snappers found on most higher end phones like the Nokia Lumia 920.
There are a few options to play with on the camera. You can turn flash on or off, change the exposure, contrast, sharpness, white balance, saturation and ISO, as well as adding a handful of effects such as sepia or negative.
Surprisingly there aren't any actual scene modes, there are enough options that you can probably get the camera optimised for most situations but that takes' time and knowledge. It would certainly have been nice if there were a few basic ones like night and action.
What you do get are different 'lenses', which add new features and options to the camera. The only one that comes pre-installed is 'Bing Vision', which is basically just a Barcode and QR code scanner, but you can find more on the store, such as one which translates printed text.
There's also a dedicated camera button, which makes taking photos a lot easier than on handsets which require you to tap part of the screen.
All things considered while it won't be winning any awards it's not a bad camera at all for a mid range handset, though a few scene modes would have definitely helped.