  In this work, we consider two recently introduced novel regular black hole
solutions and investigate the circular null geodesics to find the connection
between the photon sphere, the horizon and the black hole shadow radii. We also
study the energy emission rate for these solutions and discuss how the
parameters of models affect the emission of particles around the black holes.
Furthermore, we compare the resulting shadow of these regular black holes with
observational data of the Event Horizon Telescope and find the allowed regions
of the model parameters for which the obtained shadow is consistent with the
data. Finally, we employ the correspondence between the quasinormal modes in
the eikonal limit and shadow radius to study the scalar field perturbations in
these backgrounds.
