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The pictures are too wide, Vilero (the maximum width is 720 pixels). You could probably solve it by cropping/resizing the pictures.
I guess they are still to wide by the maximum allowable width dimension, and nothing to do with file size in KB.
Sorry to badlymad and Wampa-One. As an authentic "Australopithecus homo computer"
I have just learned what means "720 pixels". Well, after this answer I'll decrease in size my pictures too wide.