I have had many comments regarding needle sizes used for my patterns. Unless I specify, feel free to use any size needle you are comfortable with. A picture pattern may show up better with a smaller needle if you are a loose knitter. I am a loose knitter so I tend to us a US 3 or US 4 sized needle. But there is no gauge with a dishcloth and most cloths will use no more that a ball of cotton yarn regardless of needle size. Also the size of the dishcloth will vary depending on your knitting style and needle size. Also blocking your cloth may also help the picture or words to stand out better.