The descriptions can be worded variously, but we need to have a character in mind and remain consistent with that character from beginning to end.
Don't make her flighty in parts of the story and in other parts methodical, cold and calculating - at least not without reason.
In a story about Noah, we should be consistent in how we represent the three sons - Japheth, Shem, and Ham. We should find out who was eldest, who was creative, who was mathematical, who was a word-smith, who was a lover of open spaces, who was inclined to be off to himself, who was gregarious, who was adventurous, who was a homebody.
It is good to have a wanted poster in you mind, or even on file, as you write for each character.
Do the same with each location. Create maps and have someone help with landscape art. Is the world barren and hostile or is it lush and verdant and friendly? Is the city confused with winding narrow streets and tight corner markets? Or is it wide and open with plazas and broad steps? Are the building angular and symmetrical or are they rounded and abstract?
Then which sorts of structures do your characters favor? And what sorts of setting do they favor? Will your Shem be one who enjoys sunsets, or will your Ham be one who sleeps in and has never seen a sunrise?
Have a notebook or journal with several pages, or several index cards on each one. This is so easy to do now with computers.
So now I'm curious, are you writing about Ham, Shem and Japeth, or was there another reason you picked them as examples? :-)
I have written over 110,000 words of a coffee table graphic novel on The World of the Flood. And I have been discussing the possibility of CREATIONIST BELIEVERS spearheading an effort to bring about the production of a biblically accurate ACTION/Drama film about the Flood that would have initial appeal to a juvenile and up audience.
That would be an amazing production! It would be quite expensive, I imagine.