The first one is a Bewick's Wren. The second is a Red Breasted Nuthatch. The third is a female Bushtit and the fourth is a Golden-Crowned Kinglet.
Great renderings of nice clean captures. The last two of these give us some idea of how cartoonists come up with their bird characters! Please stay well and keep on sharing the great work.
The last two look comical all puffed up.
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