Not bad. It´s all about practice and a great lens. Normally my subjects are dead but i see yours are very alive. Keep up the good. I´m no where near good yet but i love macro and i love looking at other peoples stuff so keep up good work. have you ever tried one of those magnifying lens attachments. They are so cheap and they are very good for macro with your standard lens.
yes i did some photos with additional lenses (+4 , +2 and + 1 dioptres) , there is a few topics with my pictures which i did with this technique :-) , but every time when i used additional lenses i had a problem with spherical aberration, so i’ve changed lenses to macro bellows :-) , all above where took with Sigma 55-200 + bellow + ring lamp :-) , but i definitely need to change a tripod, my current one is a rubbish :-(