Ivelina!
It should be
Chrysura trimaculata (Foerster)-
However the long dark hairs on thorax are also typical of
C. hirsuta. Since I cannot see the hairs at the end of the abdomen, it's important to know where this picture was taken. In mountains or lowland?
Can you give us some more details on your pictures?
locality, date, etc.?
Thank you very much
Paolo
P.S.: very nice picture!