LG DR1A 280Vilnius Vilnius

What kind of lenses used?

This one is made with cheap 55-200mm f4-5.6 kit lens:) Sharpness is not bad overall, but lot of light is needed for this lens (only aperture at f8 or more is usable, below that image gets soft).

In general it' looking good. I am thinking about buying economic class lenses Sigma 70-300 mm f/4-5.6 DG APO MACRO (Nikon) . Is it worth to buy?

I would not recommend this lens, it's slow to focus and soft and it doesn't have VR. I would say skip Sigma and Tamron and go for the Nikon, there are lot of budget options, like this 55-200 or 70-300.