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If online galleries lack the specific frame you need, you can extract high-quality stills from your own 4K Blu-ray discs using a computer.
You need the Game of Thrones: The Complete Series 4K Ultra HD Blu-ray set. Streaming 4K has DRM (Digital Rights Management) that forces colorspace compression. The disc is king.
You need a platform that doesn't recompress your hard work.
HDR is arguably more impactful than resolution alone. The 4K releases of Game of Thrones include both HDR10 and Dolby Vision grades. These formats allow for deeper blacks, brighter highlights, and a wider color gamut. As one reviewer noted, "while the increase in apparent detail is remarkable, the application of HDR to the picture has an even bigger impact.". In practice, this means that dark scenes (like the Battle of Winterfell) retain shadow detail while candle flames and sunlight reflections appear more vivid.
For a blog post focused on high-quality Game of Thrones 4K screencaps
A sample FFmpeg command for a high-quality tonemap might look like this: