By no means am I an expert in Macro, but I have a good friend who does this frequently, and by watching him, I may be able to pass on a few of my observations. Before I go on, your image is off to a good start - great subject, cropped in close, and your use of a Macro lens. It is however "soft" rather than sharply focused and this is detrimental to the idea of a macro image which should bring out the details, patterns, & textures because it is sharply focused.
My friend almost always focuses manually - never using the auto focus mode. This assures him that his image is sharply focused throughout. He also chooses his spot and then waits patiently for his subject to land in the frame if it is fast moving. Choosing his spot allows him to keep the background simple to prevent it from competing with the subject. Your image would benefit from a cleaner background and sharper focus.
Normally, he shoots at a higher ISO than 100 - around 400 - this allows him to reduce the aperture opening to around f11 thereby increasing the depth of field and allowing for sharper focus throughout the subject. Raising the ISO also allows for a faster shutter speed at the reduced aperture.
Lastly, he tends toward images that are back lighted rather than having the light overhead which causes shadows and unwanted contrasts. He more than not uses a special flash for Macro - I forget the type.
In looking at your image data, I can see that you shot your image at a wide open f2.8, at ISO 100, at 1/1250 shutter speed. If you compare this with what my friend normally uses, you can immediately see how you might improve.
Hope this helps out some and I would add keep at it, experience is the best teacher.