The Crimson Finch (Neochmia phaeton) is commonly found in moist savannah, and subtropical/tropical (lowland) moist shrubland. They range in colour, some are more crimson-y than others as you will see in the links below. These are less crimson-y.
They range from far Western Australia-Kimberley across to northern parts of Northern Territory and Gulf Country and on to the east coast of Far North Queensland. I got a glimpse of them on the Yellow Waters Cruise in Kakadu, saw some in the bush near Windows on the Wetlands and a closer look at Fogg Dam.
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Look how bright these guys are! My photos are duller but maybe it’s just my lack of skills.
The ones I saw were more like this.