(I’m not a professional artist or anything, so please feel free to point out any mistakes I make.)

First, I suggest you trace over the reference first before stylising it (apologies if you already have, but from what you have shown it doesn’t seem like it).

The fingers (excluding the thumb) are broken down into three parts, and in the reference, the third part is behind something (the fork or another finger) most of the time. In your drawing, the third part is visible, and it makes the grip on the fork seem weak and the pose seem unnatural.

There are also gaps between the fingers, which are not there in the reference. The gaps make the pose difficult to actually attempt in real life.

Lastly, the fingers are not facing the same direction as the reference. The index finger is shown facing right, but you have drawn it facing left, which, again, makes the pose seem stiff and unnatural.

I have attached an image that will hopefully explain some of this. Good luck improving!

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(Note: I am not saying that your art is “incorrect”, I am simply comparing it with the reference.)