Yes. All alien races (i.e. humanoid, non-humanoid, and semi-humanoid) come in a great variety of shapes, sizes, colors, and skin textures.
Yes. Alien races come in all shapes, sizes, colors and unusual features.
All humanoid alien races come in a great variety of colors, shapes, and sizes, and do not look or behave as expected.
Yes. Alien races come in all shapes, sizes, and colors.
Yes. All non-humanoid alien races come in all shapes, sizes, and colors. But currently, it is unknown.
Yes. All semi-humanoid alien races come in all shapes, sizes, and colors. But currently, it is unknown.
So far we do not have any direct evidence that alien life exists, let alone what it would be like. If it does exist it probably comes in a wide variety of shapes and sizes.
An alien
We do not know. We have not made contact with any aliens.
Yes. Some alien races have different skin colors (i.e. red, orange, yellow, green, blue, purple, pink, brown, black, white, etc.).
Yes. Some alien races have different eye colors (i.e. red, orange, yellow, green, blue, purple, pink, brown, black, white, etc.).
It depends if said alien is from Space or your more garden variety location, such as Mexico.
Yes. Some alien races resemble anthropormorphic (i.e. humanoid) animals and plants. They come in all sizes and colors.
The most rarest colour is Black!! Black aliens are normally boys. You can tell if it is! :)