for entomological illustrations I use a combinations of GIMP (https://www.gimp.org) and Inkscape (https://inkscape.org).
These are both free software and Inkscape makes awesome line drawings.
If you want to get started with Inkscape, this is a wonderful tutorial (http://trichopterology.blogspot.com/2017/05/using-inkscape-for-biological.html).
The easiest way, from a microscope picture, is to draw ON the picture and then remove the picture and start adding shadows and other particulars. The tutorial i linked you is quite helpful in this!
for entomological illustrations I use a combinations of GIMP (https://www.gimp.org) and Inkscape (https://inkscape.org).
These are both free software and Inkscape makes awesome line drawings.
If you want to get started with Inkscape, this is a wonderful tutorial (http://trichopterology.blogspot.com/2017/05/using-inkscape-for-biological.html).
The easiest way, from a microscope picture, is to draw ON the picture and then remove the picture and start adding shadows and other particulars. The tutorial i linked you is quite helpful in this!
I recommend having it done by a professional graphic designer. The best tools won’t automatically produce high-end graphics. Check this: https://www.easyresearcher.com/