the fruit over and examine the area that rested on the ground.
A creamy or yellow ground spot combined with a firm rind, good overall condition, appropriate shape, and reassuring weight gives you several positive signs at once.
Compare Watermelons From the Same Pile
This may be the most practical advice of all.
Instead of asking whether a particular watermelon matches an internet photograph perfectly, compare it with the others beside it.
If several are approximately the same size, which feels heavier?
Which has the more mature-looking field spot?
Which