  In 2019, the Event Horizon Telescope Collaboration (EHTC) has published the
first image of a supermassive black hole (SMBH) obtained via the Very Large
Baseline Interferometry (VLBI) technique. In the future, it is expected that
additional and more sensitive VLBI observations will be pursued for other
nearby Active Galactic Nuclei (AGN), and it is therefore important to
understand which possible features can be expected in such images. In this
paper, we post-process General Relativistic Magneto-Hydrodynamical (GR-MHD)
simulations which include resistivity, thus providing a self-consistent jet
formation model (with resistive mass loading) launched from a thin disc. The
ray-tracing is done using the General Relativistic Ray-Tracing code GRTRANS
assuming synchrotron emission. We study the appearance of the black hole
environment including the accretion disc, winds and jets under a large range of
condition, varying black hole mass, accretion rate, spin, inclination angle,
disc parameters and observed frequency. When we adopt M87-like parameters, we
show that we can reproduce a ring-like feature (similar as observed by the EHT)
for some of our simulations. The latter suggests that such thin disc models are
thus likely consistent with the observed results. Depending on their masses,
accretion rates, spin and other parameters, we note that other SMBHs may show
additional features like winds and jets depending on the sensitivity that can
be reached in the observations.
