When specifying a retaining wall, the type of backfill should also be specified. Ordinarily, a granular backfill is used against the back of wall. Some engineers specify drain rock. If the wall is long, you may want to specify drainage tile along the back of the wall and drainage holes through the wall every two or three meters which empty out a short distance above the lower grade.
It appears that the cross section indicates 100mm insulation under the foundation. If that is intended to prevent frost heave, it won't work because frost will penetrate the soil well beyond the edge of the insulation. For a wall as high as this one, a shear key will be needed below the footing to prevent lateral movement. This is usually a continuation of the wall below grade. The bottom of footing should extend below the lower grade by a distance equal to the frost depth unless frost heave is deemed acceptable.
The proportions of the footing appear wrong for the height shown. The overall width of base is usually at least 2/3 of the height and the toe of the footing usually extends beyond the face of wall.
Continuing the concrete wall above the upper grade will raise the possibility of raising grade higher than was anticipated in design.
I recommend that you examine standards such as the CRSI Design Handbook for further guidance in designing retaining walls.
BA