If you got waves like that, you need to brush more in the places that don't have waves.
A common mistake a lot of people make is not brushing equally in all areas of your hair.
The outcome of this is waves in one area but not in others.
Some people may brush on top but not enough on the sides or vice versa. Give it time man.
If brushing is not an issue. I say the waves will come with constant brushing.
Some areas of the hair requires more attention than others. So you may just need to brush more in those problem areas.
Getting waves can drive a guy crazy trying to take care of hi head, making sure hes brushing the right way and stuff.