  Our study investigates the astronomical implications of Rastall gravity,
particularly its behavior amidst a radiation field compared to
Reissner-Nordstrom (RN) black holes. Our research delineates a crucial
correlation between the dynamics of the accretion disk and the parameters Q and
N_{\rm r}, which aptly reflect the influence of spacetime metrics on the disk's
appearance. Elevated electric charge Q prompts contraction in the disk's orbit
due to enhanced gravitational effects, while higher N_{\rm r} values lead to
outward expansion, influenced by the radiation field's attributes.
Interestingly, the charged black holes surrounded by radiation fields display
distinct visual disparities from RN black holes. Brightness decreases and
expansion occurs within the accretion disk's innermost stable circular orbit
with rising N_{\rm r} values. Our study also reveals the process by which the
accretion disk transitions from a conventional disk-like structure to a
hat-like form at different observation angles, with the redshift effect
gradually intensifying. Moreover, the results of the Rastall gravity radiation
field we consider are consistent with the constraints of the host galaxy's
gravitational lensing on the Rastall gravity parameters, enhancing the
consistency between theoretical predictions and actual observations.
