The Asset Details page is the main place you can see metadata for a specific asset, as well as having a range of options such as downloading or editing the asset.
Regardless of the file type there are a number of areas that are consistent: a preview of the asset will be displayed where possible and relevant options will appear to the right; depending on the permissions that you have. Basic information such as the file size is displayed on the right hand side, and then the rest of the metadata is displayed beneath the preview. If the asset has related files then these are displayed at the bottom of the page.
In addition to reading the metadata of the image, and possibly using this to aid your navigation, there are a number of actions you can perform from this screen such as Download, Edit, Share, Add to Lightbox, and Delete. You will only see the options that you have permission to use.
If you have permission to "download with approval", then instead of having a direct download link you will be prompted to add the image to your Lightbox where you can request download permissions for a group of files at a time.