Question: According to Dobrev, whose image is the Sphinx based off of?
About the article "Great Sphinx of Giza", section "Modern dissenting hypotheses".

Candidate passages:
Rainer Stadelmann, former director of the German Archaeological Institute in Cairo, examined the distinct iconography of the "nemes" (headdress) and the now-detached beard of the Sphinx and concluded that the style is more indicative of the Pharaoh Khufu (2589–2566 BC), builder of the Great Pyramid of Giza and Khafra's father.
He supports this by suggesting that Khafra's Causeway was built to conform to a pre-existing structure, which, he concludes, given its location, could only have been the Sphinx.
Colin Reader, an English geologist who independently conducted a more recent survey of the enclosure, agrees that the various quarries on the site have been excavated around the Causeway.
Because these quarries are known to have been used by Khufu, Reader concludes that the Causeway (and the temples on either end thereof) must predate Khufu, thereby casting doubt on the conventional Egyptian chronology.
In 2004, Vassil Dobrev of the Institut Français d'Archéologie Orientale in Cairo announced that he had uncovered new evidence that the Great Sphinx may have been the work of the little-known Pharaoh Djedefre (2528–2520 BC), Khafra's half brother and a son of Khufu.
Dobrev suggests that Djedefre built the Sphinx in the image of his father Khufu, identifying him with the sun god Ra in order to restore respect for their dynasty.
Dobrev also notes, like Stadelmann and others, that the causeway connecting Khafre's pyramid to the temples was built around the Sphinx suggesting it was already in existence at the time.
Sphinx most commonly refers to: Sphinx, an iconic image of a recumbent lion with a human head in Egyptian and Greek mythology Great Sphinx of Giza, the giant Sphinx statue near the Great Pyramids Sphinx or Sphynx may also refer to: 
The one-metre-wide nose on the face is missing.
Examination of the Sphinx's face shows that long rods or chisels were hammered into the nose, one down from the bridge and one beneath the nostril, then used to pry the nose off towards the south.
The Arab historian al-Maqrīzī, writing in the 15th century, attributes the loss of the nose to iconoclasm by Muhammad Sa'im al-Dahr, a Sufi Muslim from the khanqah of Sa'id al-Su'ada.
In AD 1378, upon finding the local peasants making offerings to the Sphinx in the hope of increasing their harvest, Sa'im al-Dahr was so outraged that he destroyed the nose, and was hanged for vandalism.
Al-Maqrīzī describes the Sphinx as the "talisman of the Nile" on which the locals believed the flood cycle depended.
There is also a story that the nose was broken off by a cannonball fired by Napoleon's soldiers, that still lives on today.
Other variants indict British troops, the Mamluks, and others.
Sketches of the Sphinx by the Dane Frederic Louis Norden, made in 1738 and published in 1757, show the Sphinx missing its nose.
In addition to the lost nose, a ceremonial pharaonic beard is thought to have been attached, although this may have been added in later periods after the original construction.
Egyptologist Vassil Dobrev has suggested that had the beard been an original part of the Sphinx, it would have damaged the chin of the statue upon falling.
The lack of visible damage supports his theory that the beard was a later addition. 
Delyan Dobrev (born 1977 or 1978) is a Bulgarian politician.
He was the Deputy Bulgarian Minister of Economy and Energy under Traicho Traikov, succeeding him as Minister in March 2012 following an energy crisis in the country which included the alleged termination of the Belene Nuclear Power Plant project and the resignation of Traikov.
Currently Dobrev is a MP from GERB.
According to published reports, "Dobrev graduated in economics in 2002 from Wesleyan University, Middletown, Connecticut in the United States.
He specialised in accounting and finance at the London School of Economics."
Callionymus sphinx is a species of dragonet known from the waters off of the Northern Territory, Australia.
This species grows to a length of SL.