You got the muscle tone on the arm on the right, nice one!

YOu obviously don't understand muscle structure and the hand is a baby hand.

Thats not even Venom its Spider man in the alien suit symbiote i think how you spell it but its good

thumbs for guts.
This is a hard drawing to make. Spiderman material always had action and to attempt to make a fanart tribute to it, it should be focused on that action. The initiative you had is great. I guess you just need more practicing and focus more when you start drawing the hands. I know we can lose "spirit" after we draw all the body and we reach that hard part. We become lazy and don't pay attention. Hands are very hard to do and in your drawing they are very important as they are basically the main "character" on it.
Keep practicing.