yes this is my question if image optimization matters in SEO. I know your answear will be 'Yes' somehow, but my another question is Many sites in the market optimize one image for all landing pages. For an example a website logo is common for all landing pages then by different keyword they optimize this single image for all pages. Is it right ? my point of view it is not right.
I didn't find the right solution from the internet.
References:

http://www.tcdio.com/codforum/viewtopic

mobile app promotion