Currently two principal techniques are used to visualize virus structure: X-ray diffraction and electron microscopy. However, those techniques require virus fixation or drying steps. In addition, they are averaging methods that do not reveal the characteristics of individual particles.
Delguste, M., Köhler, M., Gillet, L., & Alsteens, D. (2018). Topography imaging of herpesvirus in native condition using atomic force microscopy. Clinical Microbiology and Infection, 24(6), 610-611. https://doi.org/10.1016/j.cmi.2018.03.018 (Original work published 2018)