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Hi iluhin. If you’re talking about the social sharing buttons at the top of the left sidebar, the theme doesn’t include any post images in the social share link. Facebook and Twitter appear to be using profile images from their respective sites.
Facebook is using this image:

<img class=”profilePic img” alt=”Ilya Anisimov” src=”https://fbcdn-profile-a.akamaihd.net/hprofile-ak-xaf1/v/t1.0-1/p160x160/11083593_10206438633788306_447655720872759433_n.jpg?oh=4bc3ffcfe942f1f158f72d37b9a8852b&oe=557A3D14&__gda__=1438083807_6171bf57a7cca2cbd12f14dfcf8508cd”&gt;

Twitter is using this image:

<img class=”ProfileAvatar-image ” src=”https://pbs.twimg.com/profile_images/578953261736206336/tcUSk_Gk_400x400.jpeg&#8221; alt=”Илья Анисимов”>

You might be able to modify the function alx_social_links() in a child theme to include an image but I don’t have any experience with that.