Image optimization is not only for Google but also for users. So, first make sure you have a good quality image that's compressed before upload, that accelerates the blog over time especially if you have lots of photos. You can use any online image "compression tool" on Google.
For the other type of image optimization, try to describe your image in the description field, if it's about a car, write for example, "blue car on a showroom, " then, in the image title rename it with something you talked about in your article, "for example, "fastest-car". And don't overdo that, just keep it natural.
And for how to add social follow buttons on Blogger, there is a service called "Addthis" on google that does a great job, you can copy a small code and add it to your blog sidebar, so people can click on these buttons and follow you on Twitter, Facebook etc. I hope that this is clear and helpful. Good Luck.
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