Presenting your craft well is incredibly important. It is literally the difference between 5 upvotes and 50 upvotes. It is the difference between 100 downloads and 2000 downloads. It is impossible to overstate how important presenting your plane well is!

Here is the step-by-step guide on how to properly present your plane

1. Choosing your paint scheme wisely helps

If you’re on mobile, your background is an irreversible, drab, dark grey. It’s like, the least stand-out-y colour in the universe. Because the background is so dark and boring, you need to give your craft a paint scheme that makes the craft stand out.
If you have a plane, I highly recommend having a quite bright paint scheme, for example, having a main colour of white and having a bright coloured trim with maybe a small amount of black for contrast. With cars, just go all out with bright colours (maybe not magenta though), and maybe a stripe.

Examples

2. Using a background also helps... but be wise about it

Having a background can give you more freedom on your livery colours, and it can make your build more eye catching.
However, simply using a background on your screenshots isn’t a scapegoat to instantly increase the number of upvotes you’re gonna get. It helps, but you can get way more by doing these techniques
I highly recommend using a contrasting background. For example, you don’t really want to be taking a screenshot of a brown and green Spitfire while in stormy weather around Krakabloa, for example. What I recommend is with dark or drab coloured planes, taking the screenshots in light, desert biomes is generally best. I fact, you should probably take most of your screenshots in desert biomes like Maywar. It makes your screenshots stand out the best.
With very bright planes however, especially single coloured planes like a bright yellow Tigermoth or a bright coloured hot air balloon, a screenshot in the blue sky or in front of the ocean might be best.
Also make sure your light source (the sun) is behind the camera.

3. Get the right angle

Your aim when getting the angle is to get an angle where you can see as much of the plane and details as possible, that you don’t cut the nose and tail off, and that you fill the image; which, I forgot to do on that FreedomFox screenshot... :p.
Generally a really good location to take your screenshots with planes is from the top-right, a little lower than the default camera in the designer is.
And if your plane is a GA high wing aircraft, a screenshot on the ground from the front is best.
With cars, I highly recommend decreasing your FoV to between 25 degrees and 45 degrees and taking it from the front so you can easily see the front and side of the car.
The script to change the FoV are these:
Designer: //Designer(clone)/CameraTarget/Camera>Camera.set_FieldOfView (string)

Sandbox:
1. //MainCamera>Camera.set_FieldOfView (string)
2. //CameraPlane>Camera.set_FieldOfView (string)

Apparently there’s a way to set the field of view in the level using only one script, but I’ve forgotten it.
Another great thing to do is angle your screenshots so the details are easily visible. Details especially get clicks from people, especially when you can see them in the low resolution thumb nail.
Another thing, always make sure your reflections are turned up to the max (it barely effects the frame rate, tested on my iPad mini 1) and most importantly, DO NOT EVER USE ORTHO VIEW!!! It looks absolutely terrible! It’s like sabotage! If you like it, your opinion is wrong!

[BTW, this plane is a perfect example of why you shouldn’t paint your plane black. Just observe how much it blends in with the background!]

4. The description

There’s a bit of a myth where people think that having a looooooooooooooooong description is better. It’s not. People can’t be bothered to read it. They skip over it, then they complain that your plane doesn’t fly properly Kevin.
Keep it relatively short to a point that people can read it without being overwhelmed. Use headings so people can easily navigate to how to control the craft or see a little backstory. Add in-game screenshots of your craft doing things to make people think the plane is cooler.
Descriptions make your plane look professional and show that you actually care about your craft.

Take a look around at some older player’s descriptions for some ideas.

Standing out in the sea of planes

This is what it all adds up to. Your eye is attracted to things that are brighter, more colourful, and stand out.
Take a look at a few pages down the newest section

And now take a look at the highest rated section

Do you see just how much the highest rated section stands out? And how our eyes are instantly draw to these bright thumb nails? Try working on that. :)

I hope this helps! :)