Well it depends. You can follow Rouel's "typical" Japanese style example, but that's just one of the many styles available that everyone is familiar with (like when everyone had to have japanese bedsheets and tattoos in the 90's) Looking at the pictures you have now, and considering you seem to like linework I'd say you could probably develop into something more like the ever famous Great Wave by Katsushika Hokusai.
Disclaimer: Any sarcasm in my posts will not be mentioned as that would ruin the purpose. It is assumed that the reader is intelligent enough to tell the difference between what is sarcasm and what is not.
To be honest, neither give me any Japanese associations, perhaps the closest being the clouds in the first one have a feel about them which is like old Japanese ink brush work and Asian calligraphy. If you want to develop a Japanese style I suggest studying and researching old illustrations and Japanese prints. Some of it is so amazing.