One of the problems with macro shots, Isabel, is getting everything sharply focused.
You were shooting at F4.5 which is giving a very shallow depth of focus. For that sort of shot I normally shoot at F11 or preferably F14. But that can cause other problems with shutter speed and Iso settings. So I often use flash; which creates another set of problems!
Your basic composition is fine and what is in focus is sharp and well exposed.
Getting the best angle for good focus is another headache when your model is running away from you.
But remember the warning:-
Macro photography is addictive and can seriously damage your wealth!