Small Things That Require Lots of Light
At that time the macro-specificity of insects, then the longer being useful. You can be further away from the subject. If you get too close, they will fly / run. There is also a very bright shadow problem. So for insects, however, I stress, it is not essential).
The more you zoom, the more light available, which can generate some Depth of Field issues. Raising your aperture to the widest point of the desired focal length is always tempting, but you can only link headaches in focus; if you do not aim at the eyes / face (unless you want something completely different) then your drawing will not be very patient.
A lightning ring will also help with light, so you can use a fast shutter speed and a smaller aperture but that's another factor that might scare your subject. This is another way to enjoy the camera: they are faster (because it has a wider aperture) and as a result, is sharper because you get a fast shutter speed without losing light.
A long macro lens is always the answer, it adds a serious shock problem, which is another headache for you to handle. The macro photographer in general finds about 100mm is a good length, which gives you a working distance of about 4-5 inches. Smaller than that then you practically sit on the lap of an insect to get the picture, and also from that means every breath or small movement impact on ... good luck with that focus.
Very nice images!
thanks