Incorrect Bow Hold ?
This is my bow-hold.
Seems wrong to me, since the ends up slipping to slightly below the middle joint of my first finger, regardless of how much I Force it to the upper joint. It falls between the base of the finger the middle joint naturally.
How do I fix this problem.
Also, when I tilt the bow towards myself, my curvature of the thumb ends up touching the bow-hair.
Do inform me about all my errors.
I’ve been playing for 1.5 years and I wish to fix it soon, before I get attuned to this bad habit and before it accentuates.
Your bow hold is actually not that bad! Just one (most important thing) though ...
Hand shapes vary dramatically among people, and therefore so do bow grips. A big challenge is to find the one that fits your hand relaxed, comfortable and secure.
Just as a point of information, my thumb point of contact is on the right side of the thumb tip and my index finger contacts the bow between the first and second knuckles (closer to the second). I can't imagine how it would work to have the point of contact on the left side of the thumb.
You can try the following, maybe it works for you:
As another point of information, when I place the right side tip of my thumb in contact with the bow, my index finger contacts the bow at the middle joint. Again, different results for different hand shapes.
To put it simply, your bow hold seems fine. Yes, maybe having the index contact point shift towards the tip of the index by about 1/4" - 1/2" COULD be helpful. Yes, perhaps your pinky could be a bit more bent (by lowering the base knuckles).
I like the bow hold of Oistrakh and Paganini, which is more fronted than others, but I do not know which genre it is, maybe Russian...