|LPR's flag. You can see its colours|
on the stamps as well.
One of the stamps is dedicated to the "Humanitarian Convoy" in which Russia sent the separatist republics supplies, and seemingly, also weapons. The truck is a Kamaz.
Here is a bigger image of the LPR Mail logo, the cute dove carrying a letter. The picture is taken from Wikipedia in Russian's article on Lugansk Mail. And of the LPR's Ministry of Communications website (mslnr.su) I also find a picture that shows one of their mail trucks..
Back to my incoming, this is the postcard the stamps are on, with the coats of arms of Ukraine's regions.
And she also included this beautiful card from Ivano-Frankivsk region (the one with the black bird above, right). You can see a previous incoming I received from that area, here.