The background is always the most difficult part of close-up photography. The longer the lens the easier you can avoid the most troublesome backgrounds as what appears to be a smooth and soft fond to one's subject becomes dissolved into a myriad of dots and disturbing lines (from dry foliage, grass stems, etc.).
Thus, the first general advice is, be extremely picky regarding the background, then the second directly as a consequence, use the stop-down button even more frequently than the shutter release. The third advice is think in terms of visual story-telling and composition. After these aspects have been mastered, think about light and exposure and suchlike mundane stuff.
For the viewer, whatever efforts you spend to get the picture are quite irrelevant. It is the result that counts. Period. I do know this is a major conceptual hurdle to get across. Many a nature photographer thus firmly believe being able to catch a picture of a rare animal or plant, or using years to get the special capture add to the final pictorial value, but the bitter truth is: no, it doesn't. One simply must overcome this mental block.
Doing such photography over and over again and learn from one's mistakes is the only way to master the field of close-up photography. There is no short cut.
(in case you wonder, I'm speaking from personal experience on these matters).
The hover fly landing on the ragwort (Senecio jacobea) is nice, although I would be even happier with slightly softer light.