The behavior of the black-hole shadow radius (solid red line) in HSW void spacetimes with a quintessential field. In the left panel, δ_c is varied while keeping γ = 0.1 and ρ_s = 0.1 fixed. The middle panel illustrates the effect of changing γ with δ_c = 0.1 and ρ_s = 0.1, and the right panel shows how variations in ρ_s influence f(r) with δ_c = 0.1 and γ = 0.1. The orange and gray regions correspond to the EHT horizon-scale images of Sgr A^∗ and M87^∗ at 1σ, while the light blue and light green regions represent consistency at 2σ, respectively.