This was the other winner of the passerine sweepstakes from last week in Cape May, along with the Swamp Sparrow posted earlier. Easily hundreds of each species.
Really cute little bird gorgeous colours. One small suggestion but it makes a significant difference, try lowering the luminosity of the lores and moustache - you will see more detail more clearly.
Exposure, sharpness, colours all look great. OK perch. Interesting marbled BG. I would have loved for the warbler to have swung his behind more parallel to you.
Love the composition, background, and perch. Bird is nicely isolated. Not sure how heavy of a crop this is but the feather detail in the head is a bit soft.