What George says, but I will add a couple more things. On the first try to ditch the URL on the thumbs. Its ok on big pics but doesnt look too good on thumbs.
Second one I agree with George totally
Third one, maybe consider putting it all in a table to try to structure it a bit better. Also if you look at that second row of thumbs, they are too samey. You should maybe consider this:
1st thumb as it is - 2nd thumb a pussy closeup - 3rd thumb maybe as it is or a tits & pussy shot - 4th thumb a close up of her sucking her thumb.
Also try to sharpen the pics a bit.