The initial file for an optical image is usually 4.5GB ;) since it contains data from 13 different instruments in the case of the Sentinel 2 satellite.
Once fully processed (I.e you combine the data from the different sensors to make the image you want). You can still easily be left with an image file larger than 30MB.
Edit: And yes I agree it is beautiful :) you mean the rue colour optical image of the Dasht-e Lut salt desert or the Baltic Sea?
The Baltic Sea is also beautiful, but I especially like the second picture of the Dasth-e Lut salt desert in Iran.