There are a few things going on here that make this look right, and the OP's car to look a bit "off". As others have said, the thickness of the red stripe is one of the problems. It needs to be much thinner, but doing that in vinyl will require laying down an entire 10" wide stripe in red (that is the general measurement, but it varies from 9" - 12" I believe), then lay down a white stripe, and then the silver. IMO, that is the only way that you can get a very thin red stripe to appear as an outline of the silver. And, with this approach, you can make it as thin as you like. The issue of course is that you are laying down three layers of vinyl to get that effect.
The other issue is the spacing of the red stripe from the silver. In the photo above, the red is spaced much further from the blue stripe, which could tend to make the red appear thinner than it is.
Lastly,
the blue stripe in the photo above is what catches your eye, whereas on OP's car the red is what catches the eye because the silver is a much less bold color. So the OP has to be especially cautious about how he handles the red -- i.e. the width of the red, and the spacing away from the primary stripe color.
Much of this stuff is trial and error to get it looking just right. What looks good on photoshop is not always what looks good IRL. You can go through a bunch of vinyl figuring it out. Ask me how I know

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