Motleys can have A LOT of variation in their dorsal patterns. Some have a little striping. Often the "striping" are called q-tips due to the fact they often resemble a q-tip. Yours is a VERY long q-tip pattern. The biggest thing is they have a clear belly w/o any checkers, that's always the dead giveaway. Often snakes can have a motley-esque pattern, but have belly checks, or don't have a motley-esque pattern, while being actual motleys.
Also keep in mind that motleys and stripes are just different alleles of the same gene, so sometimes there seems to be a little bleed through between the phenotypes.