Theese are NOT viking runes. They are an older Rune alphabet, from around year 500 and earlier. They are called the elder futhark. The viking Rune alphabets have usually only 16 runes and there are several different alphabets from that time.
Inner right arm tattoo idea Original post: It's okay, Pluto's astronomical symbol doesn't look very good anyway. Also, Uranus's symbol in this picture is the astrological version. Other than that everything's good.