Thansk for the quick tip, Nige.

I researched the web and found that #14 needle is approx of 1/100th Inch size.

Just want to confirm...
Since it turned to kinda black with white patches of wall (bg), are you saying this is underexposed? Is this because, the paper that has come out the pinhole camera is the negative?

Do you think I should increase the exposure? I tried in my bath(dark)room, if I expose the paper for 20 sec with 15w bulb (at about 2ft above), the paper turned to black once I developed. Doesnt this mean, it is overexposed?

Please clarify.