I’m not super familiar with Elementor Custom Skin but it sounds like you’ve made a product loop, but your ACF image field is located on a taxonomy term which means that the image itself isn’t accessible from the product loop and you’d instead need a taxonomy term loop to get that data. I wish I could tell you exactly how to do this with Elementor Custom Skin but I tend to use Loops & Logic for this kind of thing. You could add a Tangible Template widget within your product loop and write something like this to make that work:
<Loop taxonomy=your_custom_taxonomy_name post=current>
<img src="{Field acf_image=your_image_field_name field=url}" />
</Loop>
