  Motivated by recent astrophysical observations, we investigate the shadow
behaviors of four dimensional charged rotating black holes with a cosmological
constant. This study is made in terms of a reduced moduli space parameterized
by the charge and the rotation parameters. For a negative cosmological
constant, we analyse in some details two models dealing with Kerr-Newman and
Kerr-Sen black holes. In certain parameter regions, we find cardioid-like
(heart-shaped) shadows. For Anti de Sitter backgrounds, a comparative
discussion is provided by computing the geometrical observables and the energy
emission rate. Inspecting the effect of the cosmological constant, we obtain
conditions favoring cardioid-like shadows for (Anti) de Sitter spaces.
