What face graphics I used

I am ordinary coder, not professional graphic designer, or even talented amateur.

Three pictures on the top are created by me, with great difficulty. As you probably noticed basic shape is similar, only details and accessories differentiate them.
The rest consist of nineteenth-century or early twenty-century portraits which I assume are freely available.
Here is a list:

• Corneille Max (1875-1924) - Bildnis eines Mädchens (1911)
• William-Adolphe Bouguereau (1825-1905) - Daisies (1894)
• Friedrich Wilhelm Schadow (1789-1862) - Portrait of Felix Schadow (1830)
• Emile Munier (1840-1895) - Mädchen mit Zwetschgenkorb (1875)
• William-Adolphe Bouguereau (1825-1905) - The Difficult Lesson (1884)
• Mihael Stroj (1803–1871) - Valentin Krisper (1844)

Pictures are trimmed and compressed to fit as textures.