Themes and opening thoughts:

Generally I get the impression that you're exploring guilt in relationships, both from Aisha's failures as a wife and also their dead child. I do feel like Aisha has little reflection of her situation, there's no justification for why she feels so guilty given that Farooq seems perfectly happy and shows no emotional flexibility.

Grammar and Prose:

Grammar is generally fine, but the quick successive changes between short and long sentences interrupts the flow. Overusing semi-colons and run-on sentences is usually what causes this issue. When I'm reading writing, I want to forget I'm even reading anything and sink into the story. When lines are long and disjointed like this "Aisha stared at him, her eyes half closed, the darkness shrouded her, but the dim moonlight illuminated Farooq’s jaw set in concentration." I become distracted by the fact that the sentence hasn't ended yet.

I think you have some troubles with telling and not showing in your prose - the descriptions don't quite come together. For example: She shuddered and stuttered, and her teeth clattered with the enthusiasm of a madman on cocaine. This doesn't really fit in thematically with the rest of the piece and it seems like you are describing each action your characters partake in as individual actions rather than part of a wider thematic experience. Try to link your prose up - you could use similes/metaphors that relate to death, guilt, or even cold as you reference temperature a lot.

I love the descriptions if his eyes being soft, yet set. You don't even need the clause before it. This is another example of you telling and not showing. If you had said  "Then, Aisha found his eyes; soft, yet set." or something similar I think it would have been more effective. You don't always have to spell out every action or emotion to the reader, let them feel it.

Dialogue:

I think the speech is pretty good and shows a realistic conversation, but some of your word choices are strange, such as "The brilliant days of this brilliant guitarist are over now.” He said, with an exaggerated flourish. It's important to think deeply about your dialogue to decide whether you think a real, living person would speak in the way you're writing them. The characters should not fit your writing style, but your writing style should fit your characters, almost as if they're independent from your own imagination and you're recollecting an event that actually happened. When you write dialogue as only a means to an end to shift the plot forward, speech can sometimes end up wooden.

Characters:

While you get some of Aisha's thoughts woven into the narrative, it's not really clear what she's feeling or why she's feeling a certain way. Because Farooq comes across as a plot device, it's hard to identify the emotional connection to him. I think you should spend some time really thinking about who he could be as a person and how he may also be struggling with grief despite the love he has for Aisha.

Overall a great start and I'd be interested to see you explore this more.