ShareThis has a tweak where you can add: expr:st_title='data:post.title' expr:st_url='data:post.url'
to each button, forcing the share buttons to share the link in the post instead of the link in the broswer.
The code would look something similar to this:
< span class='st_twitter_hcount' expr:st_title='data:post.title' expr:st_url='data:post.url'/>
< span class='st_facebook_hcount' expr:st_title='data:post.title' expr:st_url='data:post.url'/>
< span class='st_googleplus_hcount' expr:st_title='data:post.title' expr:st_url='data:post.url'/>
< span class='st_linkedin_hcount' expr:st_title='data:post.title' expr:st_url='data:post.url'/>
That should also solve the image issue too.