apparently correct rscript does not plot curve in ggplot 2-CodePudding

I have tried different script options from other related questions but none seems to plot the desired curve, despite the script looks correct and runs...

Or, with some styling choices (thanks Rui Barradas)

ggplot(d, aes(x = x, y = y))  
  geom_point(col="black", fill = "grey",alpha = 0.8, shape = 21, size = 2)  
  geom_smooth(method = nls_se, formula = y ~ a * x^b,
              method.args = list(start = list(a = 1, b = 1)),
              color = "navy", fill = "deepskyblue4", alpha = 0.2,
              linetype = 2, linewidth = 0.4)  
  theme_Agus_camacho(20)