Bruno, you can do this with Custom Shapes. You'll need to download the image files into the Shapes directory under your My Tableau Repository. (i.e. D:\Shawn\My Tableau Repository\Shapes) Then they will be available to the edit shapes dialog box. I've attached a workbook that looks like this:
Hope this helps.
Product Pictures.twbx.zip 483.8 KB
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If you are looking at putting an image in based on a URL, you can do this within a dashboard. Here are some steps.
First, place the Image field in the Level of Detail shelf.
Next, create a dashboard for your sheet. Then add a "Web Page" object.
You will be prompted for a URL, but just click OK.
Depending on your Tableau version, either choose Edit | Actions or Dashboard | Actions. Create a URL action like the one pictured below. Make sure Hover is selected and the Image field is used as the URL value.
Click OK and done.Now just hover over the name of the product to display the URL image.
Hope this helps,