An orthographic drawing is only complete when dimensions, scale and orthographic symbols are added (Shown Below).

Add dimensions (measurements). Study the way these have been drawn on the front, side and plan views.

Add the Third Angle Orthographic drawing symbol.

Add the scale you have used. For instance, if you have drawn the mobile phone exactly the same size as the real phone -this is written as 1:1. However, if you have drawn the phone twice the size of the original this is written as 2:1. If you have drawn the phone halving all the measurements, this is written as 1:2