Here is some pictures of children from Luxor
http://www.kirikou.com/egipto/familia/familia.htm

Most Southern Egyptians look like these children. Some are even darker;yet the more north you go from Aswan to the delta the lighter the people get. This diversity is attested in Kemetian texts like the Tales of Sinhue stating that'' A Delta man finds him a stranger in Abu[Elephantine]. ''Can the papyrus[the Delta] cleave to the rock[Aswan,Abu,Elephantine] denoting metaphorically denoting the diveristy in Kmt.

Yes,over the centuries there is documentation of Greeks mixing with Egyptians along Middle Egypt;particulary around the regions of Fayium,Sohag,El-Minya and other regions. This might be why some Egyptians around this region have a more Medditerean apperance than most,and thus explain why many Coptic Christains look the way they do. But notice that many Coptics around Asyut,Aswan,and Luxor are dark brown with kinky to wavy hair.

Here is what Egyptologist Frank Yurco says about the Coptics:

Yes, Egyptologists do consider the ethnicity of the Egyptians, but in
a rational way without the flaming that is seen in many postings in this
issue. To the Egyptian who considered any dark complexioned Egyptians
as descendants of Nubians or Sudanese, have you ever travelled from
Luxor to Aswan? There the entire population is dark brown in complexion.
Yet can you write them all off as descendants of Sudanese? Hardly. They
are Egyptians and that they have been that complexion for thousands of
years is demonstrated by New Kingdom paintings of the Theban population,
then just as dark brown as now, for instance, in Sennedjem's tomb at
Deir el-Medinah. So, what we have is a very diverse population in Egypt,
light complexioned in the north, and gradually darkening as you proceed
south. Another myth that needs exploding is that all Copts are light
complexioned. Ever meet a Copt from Luxor or Aswan? They are as brown
as the rest of the population there. I lived three years in Luxor and
have travelled extensively in Egypt, so I speak from experience.
Again, surveying the ancient monuments can be instrutive

Most sincerely,
Frank J. Yurco
University of Chicago

--
Frank Joseph Yurco fjyurco@midway.uchicago.edu

Frank Yurco later continues with explaining the hair texture of Upper Egyptians Coptics and Muslims:

Finally, the posters have lurched into the truth on the issue of who the ancient Egyptians were. Yes, Upper Egyptians, Copts and Muslims alike are dark complexioned, and their hair varies from wavy to kinky. Certainly, in the ante-bellum American South, they would have been classed with the other Africans who were enslaved. That ante-bellum southern image is still common in the United States, where if you have any African ancestors you are classed as "b;ack". Yet, how screwed up the Americans are is evident by how the census bureau deals with Egyptians who migrate to the United States. They are classed as "white" no matter how brown they appear!!!
Most sincerely, Frank J. Yurco University of Chicago -- Frank Joseph Yurco fjyurco@midway.uchicago.edu

Frank Yurco further explains about Coptics in Cairo:

As I have mentioned before, Copts
are found in all parts of Egypt, and those in Luxor to Aswan area are
indeed very brown complexioned, just as are their Muslim compatriots in
that part of Egypt. Farther north, you will find lighter complexioned
Copts, and again Muslims also. In the Cairo area, they tend to be very
light complexioned. That, as with the rest of the Egyptian population
has led to the confusing remarks.

Most sincerely,
Frank J. Yurco
University of Chicago

--
Frank Joseph Yurco fjyurco@midway.uchicago.edu

Notice he said confusing remarks because most people see one person from Egypt and streotype the entire population as having the same phenotype.