Well...here's one:
"H. J. Hughes, Photographer and Phrenologist, a native of Flintshire, who
began life as a farm labourer, developed a latent artistic talent and took
up photography as a profession. He set up business in a caravan near
Caernarfon Castle in c. 1860, and later opened a studio in Twthill as a
portrait painter and photographic artist. Eventually he moved on to Trefriw,
Rhyl, Liverpool and St. Annes on Sea. He spent the last years of his life in
Dyserth, dying there aged 94 in 1924. His interest in phrenology led to the
publication of a Welsh treatise on the subject."
Apparently HJ (which I suspect stands for Hugh John) left Carnarvon in about 1877.
I wasn't able to find the Llangefni Hughes, sorry.
Cheers,
China