I downloaded the pic so I could check its size. It's 1.84 kb, less than 1/50th the maximum size allowed (which is 100kb).
That's why it's so tiny.
My experience is that, when you re-size your pics, you are o.k if you are 65kb to 99kb.
Or are you in the Chatt area, OP?
Is that a lava lamp? How very 1960's!