Why is the fourth one so drastically different in style? It looks like you used it a base...and copied the head and hands of the original onto the others...whose clothes are comparatively disparate in style...lack of contrast, lack of over AA, different stance...

suspicions arise.
If you used a base please state your sources.
And what? Pillow shading is never good, but neither your pillow-shaded nor your "lightsourced" ones are better, because they're both sorta

. And the third one is pillowshaded.