This is not currently supported.
I'll work on this feature and update you back.

I've updated lib that will show images as preview after upload. (clicking will open in new tab)
http://prntscr.com/e2trmp

I'll be emailing you update.

Thank you sir.

It is very great feature.
The image shown in the full page how can we set the size.

Thanks

Not supported from api now.
You can edit core lib file.

var i = "<br><img onclick='window.open(""+data.msg+"")' width='90%' src='"+data.msg+"'>";