changing resize options on my theme

i use aqua resposive tabvn theme,when i upload a picture by using blog content type my picture resizing automatically.the problem is how can i change this option coz its also cuts picture and i dont like it
example;

this is my original picture 700x470 px
http://i.hizliresim.com/lYZ3jB.jpg

when i upload its becoming 700x320 px
http://i.hizliresim.com/VpDPay.png

some of my setting;
http://i.hizliresim.com/DXDB9m.png

manage display says its 480x480 px but its not like that
http://i.hizliresim.com/mlo45Z.png

so how can i change the picture style options for this theme?