Right click on your image file in explorer and view the thumbnail in context menu.
FastPreview is a simple image viewer that adds the ability to view thumbnail preview of your images directly in the context menu. Just right click on any image file any where and you will get a preview image as well as basic info of image dimensions in the context menu.
FastPreview’s context menu is although the main feature of this software, but it also does add an extra image metadata viewing tab to file properties panel. Clicking on the thumbnail in context takes you to full size image viewer but that is not meant to replace your other image viewers as this one has pretty limited options. You cannot zoom in, or scroll through images etc. It just provides a quick window to show image in original dimensions and give you option to resize or rotate the image only.
Download the software @ Official site