Looking up and displaying a picture based on a cell value

Hi all. I'm a complete noob to Excel programming, and not much of a user of Excel in general. With that in mind, I'm hoping someone can help me here. :)

Following this guide:
http://www.mcgimpsey.com/excel/lookuppics.html

I've managed to set up my own workbook with a dropdown list in a cell prompting the display of the corresponding picture to display on the worksheet, just like in the guide.

However, my question is, how can I have another separate dropdown list showing it's own linked pictures? At the moment the macro hides all images excluding the one in the lookup cell. Thanks.