This isn't first contact, but rather, first presentable photo nearest to first contact:
Below shows Venus taking a bite out of the sun:
The teardrop effect can be seen here. Though, I can't claim the effect is a genuine tear drop instead of distortion from the wind.
And another, almost teardrop effect:
A few minutes into the sun:
Here is a close-up of the anti-teardrop effect. A few of my photos at second contact (the point Venus appears fully in front of the sun's disk) showed a bulge of the sun where a teardrop shadow should be. Is it my viewing conditions or something else?
As the transit progressed, the clarity of my images got worse. As of today, I've examined only a third of the photos.
UPDATE: A few more photos added:
This one is my last clear image at this magnification:
As the sun got lower in the sky, I shortened the focal length to get a smaller image. The smaller image showed less of the atmospheric distortion: