It depends what you mean by ways to show submissiveness, because there are a lot. I agree with denu (as usual), in that your Master should be your guide in how he wants you to display your submission to him. I could, for instance, tell you the thousand and one little ways my pet shows her submission to me- but if they're not to your Master's taste, then they'll be of limited use to you.

In general, I would say that the best way to show your submission is to know him better than anyone else- and with your every word, action and thought, keep foremost in mind that you wish to please him and make him proud of you. If you can remain focussed on that, then your submissiveness should show through.