well he definatly has a lizard like tail.

he has a more of a reptilian look know.

but then so did jirobu kinda he had some scales.

mabye it has to do with his gaia seal.

and sasuke had what the heaven seal. which maybe all the other sound nins have couse they had a look more similar to sasukes. but it could be that kimimaro's seal is a deviation of the basic cursed seal. maybe oro was makinga new one and it wasn't perfect but it increased his streangth. and maybe that new seal messed up kimimaro.