Great artwork but I'm afraid I really don't like the font, mainly because it's hard to read.

From a physics point of view it seems extremely unlikely that a tidally locked world could support life, mainly because on one side the atmosphere would literally freeze and precipitate onto the ground (eg the dark side of tidally locked Mercury has gaseous ice deposits, even though it's so close to the sun), and on the sunward side all the atmospheric water would be stripped away. Even if this wasn't the case, there wouldn't be sufficient plant and animal life to maintain a balanced atmosphere with oxygen and CO2 suitable for human life.

But it's a nice fantasy idea - perhaps the habitable zones are protected by a kind of magical barrier? How would their society have evolved to live in constant twilight?