artissimo: 1 b42e3e63 94d5 46a7 9b3e 8c162bc43259 by apple xiebinDigital Painting Techniques: Volume
artissimo: 1 b42e3e63 94d5 46a7 9b3e 8c162bc43259 by apple xiebinDigital Painting Techniques: Volume 2: Practical Techniques of Digital Art Masters -- source link