That there is little if any historical truth in that characterization is not ultimately the problem. The painter Georges Seurat in “Sunday in the Park With George” — a show referenced in the first lines of the script — is largely fictionalized too, a cad to his mistress and generally unlikable. “Lempicka” doesn’t have the craft, especially in the mis-accented, often vague lyrics, to make its title character a relatable modern woman, nor the boldness to let her be awful and great. Perhaps if it were less of a machine she could be more of a monster.