You've come to the right place.

Unless you use a low-end device. We're gonna crank the settings to the highest for this one, to make somewhat good looking shots.

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Part 1: FOV

Set your FOV to the lowest. It gives more depth to the aircraft, rather than the surrounding background. Also, zoom in more to the aircraft of course.

High FOV, zoomed out

Low FOV, zoomed in

See the difference in depth and quality? Yeah.

A-10 by BrunoBG
Modifications are by me

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Zooming onto the aircraft gives a lot more depth and quality to it than the surrounding background. Even if you have a sick background to use, if you don't focus much on the aircraft you're taking away the main focus, the aircraft. There's a fine line between both aspects, and tinker with it to see what looks best.

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Part 2: Ambience and Environment

Play with these two settings and see what's best.
I personally use sunset/sunrise for screenshots, and weather set to clear.

X-02S Strike Wyvern by GuyFolk
I also include the sun so the screenshot doesn't look too bland. Remember to turn off "Image Effects" so the sun doesn't blind you, lol.
Sometimes though, I like to mix it up a bit and set weather to few clouds.

X-02SN Strike Wyvern "Mister Blue" by GuyFolk
Clouds give a bit of ambience to the shot. Also, it's really cool.
Play around with these settings to get results that fit your taste.

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Part 3: Cockpit

Hold on, you wanna make an interior shot?
Crank the FOV back to the highest. The focus is the cockpit, so show ALL of it.
Maybe look at the sun too? Satisfying.

No word here. Cockpit shots are simple, but can be amazing.
Chengdu J-20 by JPDD

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Also goes for a runway shot, put some focus on the runway. Personally, I like to set the time to around 6, as it gives the setting of an early morning sortie with the (nonexistent) boys.

FAD-90S Galleon by DwiAngkasaAeronautics
You could go the extra mile and add an aircraft taking off before you do, to really give that morning sortie vibe. I didn't do it here though, so here's totally relevant cockpit shots.



AIDC F-CK-1 V by CptLiar

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You could also, do it while in flight with each other.


Su-57 "Felon" by GuyFolk
Su-57 Felon (in background) by Kiv
Fly-by shots are really amazing if the AI cooperates with you.

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Part 4: Background

Like I said, it's always okay to mix the focus between the aircraft and the background.
So I'll help you with that.

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First of all, if you're making a takeoff/landing shot, some focus should be on the runway itself. And show the aircraft opening/closing its landing gear before touchdown.

This for example, shows the wind sock (or whatever you call that thing) and some land in the background. And also the craft closing its landing gear after takeoff. Some feature showcase.
X-02S Strike Wyvern by GuyFolk

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For a shot like a flyby near a mountain, show said mountain a bit. Bank to the face of the mountain, or the camera.
You get the point, don't attract too much view to the background, don't attract the view to strictly the aircraft only. Unless you're showcasing features, but I digress. See what fits best for you.

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Part 5: Showcasing Features

I don't have a lot to say here, but for weapons, just use them.
For miscellaneous features like targeting pods, use it too.

SINTREX Targeting Pod by DwiAngkasaAeronautics
Shot is also by the same person. Really amazing!
Focus the view on the weapon(s) being used, and only that.

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Maybe also show the bottom (or a peek of the bottom) of the aircraft, cause the weapons are gonna be always there. Open a bay or two if necessary.

X-02S Strike Wyvern by GuyFolk

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If this has helped you in making somewhat good looking screenshots despite being only on mobile, then you're welcome! No, I'm not asking for an upvote or a follow, or anything like that.

If this hasn't covered shots you want to do, then I guess just take inspiration from other players. I do it too! Learning from others is the best lesson.