My input-Essense Flare - Could be an angel, but from the name and flavor text I feel like this could be a spirit. The picture is the only thing lending itself to be somewhat of an angel and even then it's not real clear. I'm leaning towards no. Also if you look at other art from that Artist he tends to like whispy/wingy head designs. Even on cards clearly not intended to be an angel. Closing argument- The card is blue, blue does spirits, but not angels. So it's a no in my book.
Putrefy - Definitely, you can see the bone of the wing, feathers, humanish form. No other creature would have those characteristics.
Divine Intervention - No way this picture does not depict angels. Combination picture and name = angels!
Emerge Unscathed - I'm going to have to disagree with Harbringer. While it does give me vibes of Icarus, The actual creature-angel cards from that block have wings of a similar design. Furthering the argument the art from Emerge is from the same artist as Admonition Angel (Same block, Same wings, Same Artist)
Righteous War - Sure looks like an angel (Spirity angel, but an angel) The flavor text is from a Human Cleric but the art on that card is reminiscent of an angel as well. I'm going to go yes on this being an Angel. (Also the name lends itself to it being an Angel/Demon war)
Seashell Cameo - Going by the picture 100% yes. The flavor text is a little sketchy, but I'm thinking the carver of the Cameo would have been thinking angel if he wanted to carve a women with wings (women or a bird comment)
[Edited 3 times, lastly by mcelraca on September 09, 2012]