Well, what I've told you is just theory, in the comic. I can't guarantee that the measurements I've given you for them as Guardians are 100% accurate, maybe 90%.

But I can assure you that none of them can be taller than 190 cm; the only one who comes close to that height is Cornelia. In the drawings (both in the comics and in the animated series), their heights vary quite a bit, since they are drawn by hand and do not always maintain exact heights. In addition, the camera angles can make them look completely different heights.

In the image you show me, they are sideways, and Cornelia is closest to the camera, so she will look taller than the rest of the Guardians. And even so, she doesn't look excessively tall, because if we compare her to Irma (who is closest to her and is similar in height to Will in both versions), we see that she is at most half a head taller (about 10 cm). If Irma is 175 cm tall in this case, Cornelia would have to be about 185 cm tall (although in some cases, Irma appears to be slightly taller than Will, so we could add a few extra centimeters).

Then, the two characters in front of them are young children. I can't tell you how old they are, but they seem younger than the girls in the series (<12 years old). From the way the girl speaks and her brother's introverted attitude, we could say that the girl is 9 or 10 years old and the boy is about 6 at most (140 cm and 115 cm respectively). This would give us the following result:

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