MYANMAR model Han Lay did not win last week's Miss Grand International beauty pageant, but she'll be remembered as one of its most impassioned contestants. The 22-year-old made heads turn in Thailand during an emotive speech where she pleaded for "urgent international help" for her country, the same day 141 demonstrators were killed in a crackdown by military rulers she said were selfish and abusing their power. Yesterday, she said her compatriots in an anti-coup movement would not back away from a struggle that has so far claimed close to 550 lives in the two months since the generals overthrew…