I recently renewed my passport through Nepalese Embassy in DC. I got the letter size paper to print the passport renewal form. You can get it through amazon.com and other online sites (staples where you can also do store pick up). For the photos ( Qty =3)  it got 2X2 photo and make it our passport size (I think it's 35mmX45mm). Along with this I sent my old passport ( I kept I-94) and also original nagarikta.         I got it back in  around 2 months though they said it would take 3 months.