It's really good. Got a link to the comic-in-the-works?
Third-ing that black on dark purple is pretty much impossible to read. The white outline was a good idea, but the background shouldn't be the same colour as the inside of the letters either - it blurs the white lines.
I tried writing a similar concept once (only in that one, the overlord's kid was an adopted Chosen One, who'd mess things up all the time (despite his good intentions) because of his Incorruptible Pure Pureness
; but the general idea about it being hard to be an Overlord and a parent was the same).
I found the airship one interesting because - I thought - it hinted at a bigger picture about what Zaran's world was like. If Overlord's Teenage Daughter is the starting concept, then the plot if you planned a bigger storyline around that would involve creating more details and characters about like that.