Image Search still represents for most industry an important SEO subchannel. Given how Image search now works, many Image visits are only virtual and therefore invisible in analytics reports. Image Search is still a fantastic opportunity to improve brand awareness.
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Make sure images are well optimized: from image hosting to image alt tags. In case your website actively uses images, use Image Search to improve brand awareness.
Alt Attribute often called alt tag gives important information to the Google bot regarding what the picture is about. If the image path is incorrect, the alt (alternative) attribute will show instead.
The title appears as tooltip when there is a mouse-over above the image. Use it to give more information about the picture. Although not as important for SEO as the alt attribute, it should not be neglected. Avoid copy and pasting the same text you have as alt attribute.
Image size and format
If your image is too big, this will affect pagespeed, especially for mobile traffic.