Hmm what spurred on these sketches? The beach piece is somewhat immaturely drawn and could have darker tones and shadows. Pretty good Valentines Day armatars nice composition. I find the colours a little intense in some of them though, particularly the red and blue one. Did you get permission to use the AG shield?
Forgot to mention, I like the rose, it's simplicity is perfect because the way you've drawn the lines pretty well you can instinctively recognise it as a rose. The blue outline gives it a little je ne sais pas. Prefer the simple version to the coloured. The colours add interesting texture but they don't seem to go too well with the outlines.