General, all these images have
very slight clipping when I open them in ACR which is easily solved by reducing highlights/exposure a small amount. Not sure of your workflow but in RAW I will set my black/white/shadows/contrast/clarity and make sure the histogram does not quite reach the ends (upper end is more important). This then allows some leeway for later sharpening and the very final stage can be to set the black/white point for which I use levels.
Generally I have found with close-up work that if you get things right in camera, especially ensuring no clipping at the white end, there is very little to do in post work, as we want things to look natural.
Well done
Edit : What I did forget to say was that with all these images you are getting the basics of the close up work right, we can easily nit pick but producing an image where only nit picking is required is an achievement in itself
Grahame