The tablet below is a heftly loaf of clay with relatively large signs.
The following two pictures are of extracts from the Vassal Treaties of Esardaddon (VTE) with a fake seal impression. I wrote this to experiment with writing a tablet over multiple days. (I wrote one column per day over a week.) To keep the clay moist I covered the tablet with a damp (not wet) hand towel. It worked perfectly. My hand in the picture gives an idea of how small the signs are.
The following are some laws from the Laws of Hammurabi, written in small signs:
The following is a basket of tablets:
A closeup of the basket:
A multi-column tablet with some of the Laws of Hammurabi:
Closeup of some laws:
Bramanti, Armando. "The Cuneiform Stylus: Some Addenda." At http://cdli.ucla.edu/pubs/cdln/php/single.php?id=000065. Illustrated discussion of the type of stylus used to write cuneiform.
Cammarosano, Michele. "The Cuneiform Stylus." Mesopotamia. Revista di Archeologia, Epigrafia e Storia Orientale Antica XLIX. Firenze: Le Lettere, 2014. Pp. 53–90 and Pl. 1. (Check for availability on academia.edu.)
Finkel, Irving and Jonathan Taylor. Cuneiform: Ancient Scripts. Ancient Scripts Series. Los Angeles: J. Paul Getty Museum, 2015. A nicely illustrated museum book with good photos of a variety of texts and explanation of the writing system. See pp. 74–80 on the stylus and techniques of writing.
Huehnergard, John. Introduction to Ugaritic (Peabody: Hendrickson, 2012). See pp. 19–20 for a diagram of Ugaritic signs with the order in which the strokes were written in antiquity.
Radner, Karen and Eleanor Robson. The Oxford Handbook of Cuneiform Culture. Oxford: Oxford University Press, 2011.
Thicket, David; Marianne Odlyha; and Denise Ling. "An Improved Firing Treatment for Cuneiform Tablets." Studies in Conservation 47/1 (2002): 1-11.