Link images with numerical values
You can link the images with numerical values, e.g. to display rising prices with an upward-pointing arrow and falling prices with a downward-pointing arrow.
To do this, you need to create a simple MM-Talk formula that assigns the same string (e.g. "increased") to all values that fulfill a certain condition (e.g. "higher price than the previous day"). Then create a picture with the same name ("risen") in your picture list and assign it to the string.