Hi Jessica,
>>>
Is there anywhere in the HTML log export that there is something saying which image filename means success, which means info, which means error, etc?
<<<
In root.xml, you can find something like this:
<LogData name="Keyword Test Log [Test1]" status="0">...</LogData>
By analyzing the value of the status attribute, you can find out whether a test run was successful:
0: a test was successful ('ok.gif' is used);
1: there were warnings ('warn.gif' is used);
2: a test failed ('error.gif' is used);
The images you were speaking about describe the status of test actions.