Okay, I will take a peek at all of them. Note that I will be only mentioning criticism, so I won't be saying things that I like about them. Ones with "N/A" mean that I couldn't find anything in particular about them that would need to be improved on.
1: The red zipper in the middle is a bit plain, remember to use lots of colors!
2: The overall skin is a bit busy. Maybe use a color in the middle (greenish brown) to soften the rather harsh two colors. Also, the shirt color (blue) is a bit strong, so maybe a less saturated blue (grayer blue) would look better?
3: N/A
4: This skin is a bit plain, and you may notice that most skins that players actually use are detailed skins, usually resembling humans. However, skins like these tend to be low in demand, yet many are out there. Try to stay away from these types of skins.
5: The black frames of the glasses stand out a bit to much. (look at the glasses
here) Also, avoid using light/bright/neon colors for pupils.
6: The headphones have a bright blue color, as I said with #2, try to stick with a more grayer version of blue. This also goes with the side parts of the headphones. Stay away from putting complementary colors too close.
7: There is much more detailed skin on the sides of the head than the face.
8: N/A
So overall, I think that your skins COULD use some work, but you still seem pretty talented! =) Keep it up!
