The actual hull of Kylo Ren’s ship actually more closely resembles the Star Destroyer, I can’t help but wonder if Kylo’s craft will actually be much larger than your standard TIE Fighter.
All three of these models are built to the same scale, so the Star Destroyer is the same size as the standard TIE Fighter.
One thing that we can’t tell from the image is the actual size of the craft.
It certainly appears to have more going on inside than simply the cockpit, though it’s difficult to tell from this angle, since all we really have a clear view of is the wing.