After trying this way, I assume a problem: my need is to get current item image (not only show them in article like custom blogs and put it in a header). So, I really need a way to get access to variable $this->item->image.

Any idea for how could this be done? k2 content module shows ALL items (not only the current).

Ok. then you need a K2 plugin (It will still render in the component area but it closer to what you need).

This will get you started getk2.org/extend/extensions/90-example-k2-plugin-for-developers

Ok, new sweet idea: set a SESSION to get $this variable. Works as '1'+'1'=11 (actually need to figure out how could this sum equals 11) :P

Firstly need to set cookie in item.php template view.
Something like: