I heard somewhere that u should check how jagged the edges are. Most pc edges aren't completely smooth, so that can be a good indicator of it's in real or not from what I've seen.
colours, and printing quality! the colour saturation or brightness can be off in fakes, and can sometimes be sloghrly blurry, or even edited. quite often too the text on the back can be the wrong font, size, colours, etc
Find other pictures of it and look at the edges. Most times fake cards will have to be cropped a little bit tighter in because they need to allow trim area from the original image. If it looks zoomed in at all or has “less” image it’s probably been scanned, reprinted, and trimmed down.