Pieria will be the name of the restaurant. The main word "Pieria" is the focal point of the logo, but integrate the restaurant's description if possible on the logo as well, which is "Tapas Lounge & Restaurant".
Logo design should be simple for reproducibility purposes on different medium and should be limited to 3 colors or less.
It is important to transmit the story behind Pieria in some way. Thus, the logo should have something related to Pieria. So, what is Pieria?
Pieria is home to Mt. Pierus, home to the Muses, as well as the Pierian Spring. Mt. Olympus, the highest mountain in Greece and throne of the ancient Greek gods, is located in the southern part of Pieria.
In Greek mythology, the Pierian Spring of Macedonia was sacred to the Muses. As the metaphorical source of knowledge of art and science.
The Muses in Greek mythology, poetry, and literature are the goddesses who inspire the creation of literature and the arts. They were considered the source of the knowledge, related orally for centuries in the ancient culture, that was contained in poetic lyrics and myths.
The emphasis should be on its meaning and relation to the muses, inspiration, and the mountain. Maybe a mountain in the background of the logo is a possibility.
Finally, take a look at the muses at Pieria in this painting: http://bit.ly/hb5D9k