>>2664330shit photo to begin with tbh
You blew out the sky, you need to bring the highlights down although your photo is too overexposed so I'm not sure you can help it very much. At least try a graduated filter for the sky.
The temperature is better on the original, cool it off a bit. It looks too yellow.
Try increasing the contrast and adding a bit of clarity. bring out the shadows a little more.
>>2664355A high quality jpeg will be much much smaller than png and will look just as good. png is best for when you have extremely strong contrasts with sharp edges like vector images.