Certainly Daggerfall due to its default 320*200 resolution displays lot of pixels (more or less filtered depending on the scaler you choose in your DOSBox), but i think there are some nice things to capture.
Too bad Bethesda have not made a 640*480 resolution like they did in their "The Terminator: Skynet" or "Battlespire" that used the same Xngine as Daggerfall and allowed to play in 320*240 and 640*480 , it would have sure enhanced those pixel display a very lot.
Anyways, if you are new to computers or internet functions :
To make screenshots from your DOSBox-Daggerfall sessions, just press "Print Screen" located on your keyboard.
Then open Paint that is a part of Window, or other similar programs (from the free and very nice http://www.irfanview.com/ to the expensive photoshop) and click Edit then Paste, resize or cut unwanted part if you want then save the pictures in JPG format and upload them on some image hosting website, like http://imageshack.us/.
To start with something :
http://img188.imageshack.us/img188/2695/46070330.jpg
http://img43.imageshack.us/img43/4823/63687631.jpg
http://img11.imageshack.us/img11/5559/82826089.jpg
Note : for expanded view distance to make the game prettier, be sure to check http://www.gamesas.com/bgsforums/index.php?showtopic=1014836