English Sketch: I really love her face and hair, and don't even get me started on the colors you used, they really went together (which looks easy, but isn't since you didn't even use that many). BTW, you drew this under the time span of a song, that's like insane, I can never do something like this, and my sketches tend to take obscene amounts of time. Anyways, I really like the strokes and the outlines, great stuff.
Plane Flight Sketch: This one is my favorite. I don't even care that it is a sketch. Though the shading is simple, for some reason it really works with the drawing, I think that the white background adds to it, and just makes it blend rather nicely with the shading. The armor was well drawn, very detailed and her flowy hair was well drawn, the angle that you drew her face was what really made me like it. I'm really not that great with different angles/perspectives so I admire those who can. Good job <:.
Angel Sketch: Out of the three, this one was my least favorite (not that it's not any good, I just think that the facial expressions were a tad better on the other two than this one). The overall effects worked nicely, though the cyan lighting/beams seemed a bit off, maybe they need to be placed differently (though I myself don't know what it is off about them, so I can't really explain, it's like a feeling ya know?) Over all, it was very nice, and the coloring of the hair I think was the best, cause it really gave some depth and volume, it didn't look flat or simply airbrushed.
On a side note, your Bluest Melody drawing is my all time favorite. The coloring/shading style used there was amazing (and in fact one of the ones I used to want to incorporate to my style, but it didn't work out).