  Considering a charged black hole (BH) surrounded by a perfect fluid radiation
field (PFRF) in Rastall gravity, we investigate this BH shadow and photon
sphere on different spherical accretions backgrounds. The effect of the PFRF
parameter/BH charge on the critical impact parameter is studied by
investigating the light deflection near this BH. The luminosity of these BH
shadows in different spherical accretions is obtained, respectively. It is
found that the shadow of this BH with infalling spherical accretion is darker
than static spherical accretion, and the photon sphere with infalling spherical
accretion is brighter than a static one. We creatively investigate the effects
of the BH charge/PFRF parameter on the luminosity of BH shadow and photon
sphere. The results implying that the BH shadow is a signature of space-time
geometry, and the photon sphere luminosity is affected by accretion materials
and BH itself.
