The real mug is likely a perfect cylinder, but since it is shot slightly from above, the bottom is farther from the lens that the top, so it looks smaller, and you get a slightly conic shape. This old toolbox is a perfect 18cmx19cm square but shot from above it looks like a trapeze:
And the square in front of it has an angle of nearly 97° in the picture.
This is why the second attempt has a perspective transform inserted since this is exactly what the perspective transform is supposed to fix:
This also makes the bottom more curved than the top, but ofn-bend-path comes to the rescue, with the two envelope strokes following the top and bottom curvature, and two guides marking the corresponding diameters:
And the square in front of it has an angle of nearly 97° in the picture.
This is why the second attempt has a perspective transform inserted since this is exactly what the perspective transform is supposed to fix:
This also makes the bottom more curved than the top, but ofn-bend-path comes to the rescue, with the two envelope strokes following the top and bottom curvature, and two guides marking the corresponding diameters:
Of course you can start by fixing the mug with a perspective transform, but this always gives a slightly artificial look (for instance, the top of the toolbox and the foot of the square would be very thin in a picture where the square is square).