High Resolution for Tab Bar Icon on retina display - objective-c

I have a TabBarViewController which include image.png and image#2x.png as TabBar icons. XCode will automatically choose the image for retina and non-retina display.
I have designed my icon using Photoshop (30x30 and 60x60) but it is not sharpen to display on retina. The information about my icon (png - 8bits, 300dpi)
I saw Amazon - they have a TabBar icon very sharpen and i want to display like that but 60x60, i think it's not enough. Any idea?
Tks in advance!

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