Have you looked in the IGRAVER tutorials.
Sam has an excellent tutorial on the running leaf pattern.
There appears to be a difference in the scaling between the sketch and the engraving. The sketch appears to be about 2x3.2 while the engraving looks to be about 2x4.5. These are just ratios, assuming the width is always "2".
The sketch has a rather pleasing look, the engraving less so. You have identified one of the issues, another issue may be the relative width vs length difference. Take your time, everyone has these issues, practice, practice, practice.
Good Luck!