  We investigate the shadow and optical appearance of the hairy
Reissner-Nordstr\"{o}m (RN) black hole illuminated by two toy models of static
accretion. The hairy RN black hole was constructed in the gravitation
decoupling approach to describe the deformation of a Schwarzschild black hole
due to the inclusion of additional arbitrary source (scalar field, tensor
field, fluidlike dark matter, etc). So it is characterized by the parameters:
mass ($M$), deformation factor ($\alpha$), electric charge ($Q$) and the
additional hairy charge ($l_o$), differentiating from the case in RN black
hole. Though the specific background theory that results in this hairy RN black
hole is still tricky, here we shall focus on the novel observable features
introduced by the hair of this black hole. First, we find that for the hairy RN
black hole, the event horizon, radius of photon sphere and critical impact
parameter all increase as the increasings of $Q$ and $l_o$, but decrease as
$\alpha$ grows. The three characterized parameters are found to have
significant effects on the photon trajectories, shadows and images of hairy RN
black hole surrounded by the static accretion disk and spherical accretion,
respectively. Particularly, both $Q$ and $l_o$ have mutually reinforcing
effects on the optical appearance and shadows of the hairy RN black hole, which
implies that we may not distinguish the electric charge and hairy charge from
the shadow and image of black hole in this scenario. Additionally, because of
the competing effects of the charge parameters ($Q, l_o$) and the deviation
parameter $\alpha$ on the observed intensities of brightness, the optical
appearance between the hairy RN black hole and RN black hole could have
degeneracies, indicating the indistinguishability. Our current results
contribute more to the phenomenal aspects which could be helpful to build the
background theory of hairy RN black hole.
