Hello Adrian,
1 Add (list/read/query) database service to the page.
2 Click "Edit mapping".
3 Make mappings in accordance to your needs.
4 Link some response parameter to image component asset and click "Add JS".
5 Populate it with following code:
prevar src;
if(value == 1)
src = "http://domain.com/smileyFace.png";
if(value == 2)
src = "http://domain.com/sadFace.png";
if(value == 3)
src = "http://domain.com/questioningFace.png";
if(value == 4)
src = "http://domain.com/kissingFace.png";
return src; /pre