Your tree is already part way toward the final image. Lower branches are similar angles so now it's just a matter of grow and trim regularly to build up ramification.
Note that the desired image has some taper in the trunk, especially up near the top. The trunk of yours appears thicker toward the top. That's usually a combination of strong upper growth and too many branches in the apex. You also have a couple of clusters of branches (bar branches) which are almost certain to develop reverse taper as they grow.
Best way I know to get taper toward the top is to chop lower and train a branch up to replace the current apex.