  The optical appearance of the numerically black hole solutions within the
higher derivative gravity illuminated by an accretion disk context is
discussed. We obtain solutions for non-Schwarzschild black holes with r0 = 1,
r0 = 2, and r0 = 3. Further analysis of spacetime trajectories reveals
properties similar to Schwarzschild black holes, while the r0 = 2 black hole
exhibits significant differences. The results reveal the presence of a
repulsive potential barrier for the black hole, allowing only particles with
energies exceeding a certain threshold to approach it, providing a unique
gravitational scenario for non-Schwarzschild black holes. Additionally, the
optical images are derived through numerical simulations by discussing the
trajectories of photons intheblackholespacetime.The distribution of radiation
flux and the effects of gravitational redshift and Doppler shift on the
observed radiation flux are considered. Interestingly, previous analyses of the
optical appearance of black holes were conducted within the framework of
analytic solutions, whereas the analysis of numerical black hole solutions
first appears in our analysis.
