What is the difference between normal stickers and foil stickers in CS GO?

I bought one normal sticker for pick-em challenge and it cost 0.99$. Now it shows that I can sell it at 0.78$ but in market there are few foil stickers which are more expensive (7$ to 12$) but the stickers are the same. In my case it's team envious sticker so I'm kinda confused as to what the difference between normal and foil stickers are when there are holo stickers, too.

I have searched on Google and Steam community and found that foil stickers are shiny, normal ones are blue and foil stickers show different color. But all this is just a guess and no one is sure so can some one help me to find the difference?

The links I already found about this, but are no use are these:

• What's the difference between the normal, holo and foil stickers? (on Steam)
• What's the difference between Holo stickers and foil stickers? (on Steam)