This tongue shows clearly a relatively common condition of Stomach-Yin deficiency (leading to some Heat) and Spleen-Yang deficiency. The cracks in the Stomach area indicate Stomach-Yin deficiency and the overall colour of the tongue is slightly Red showing that this Yin deficiency has lead to some Heat, but the sides of the tongue in the Spleen area are Swollen and Pale. This relects Spleen-Qi and Yang deficiency leading to Dampness. 

It is important to distinguish between the Liver and the Spleen areas on the sides of the tongue. The Liver area is a longer and thinner strip, covering nearly the whole side of the tongue, whereas the Spleen area is shorter and fatter and in the middle of the side of the tongue. 

In the case of this patient, it would therefore be necessary to treat both Yin deficiency (of the Stomach) and Yang deficiency (of the Spleen). Even though the Yin deficiency (and Empty-Heat) seem predominant because the main area of the tongue body is Red and it is peeled, it is likely that the Spleen deficiency came first. As the Spleen and Stomach are so closely connected, a long-standing case of Spleen-Qi and/or Yang deficiency may lead to a deficiency of the Stomach (which has a tendency to become Yin deficient).