Card image displayed smaller than it supposed to be


How to display the image in the twitter card in larger dimension.

For example I have this tweet using the Twitter Card


The image displayed is much smaller than the original image.
But then I upload the original image using twitter, the image displayed is much larger and readable.

Here’s the meta in the HTML

<meta property="twitter:card" content="photo" />
<meta property="twitter:site" content="urban_indo" />
<meta property="twitter:title" content="ampera lt/lb 1000/1000 siap huni" />
<meta property="twitter:image:src" content="" />
<meta property="twitter:image:width" content="652" />
<meta property="twitter:image:height" content="480" />

Did I do something wrong?