Welcome! There are many things in this image that are very successful. The color palette is very nice, the composition, with the coins falling out of the picture towards us, is awesome, the sense of movement and dynamics are very strong.
Two aspects where it could be made stronger are the storytelling and, as others have mentioned, the anatomy of the character. From the story perspective, I wonder what is he holding (a small purse?). It seems counterintuitive, unless the purse contains some very special item that he was looking for (but then this could be made more obvious). With all these gold coins around, he should be showering himself in coins, or holding some more prominent piece of treasure. Or maybe even the treasure map that helped him get there. Also, the dot eyes make his gaze directionless and slightly vacant, so his face is not participating in all the excitement of his body.
Others have commented on the anatomy already. You have tried to pull off a very complex feat here: super-dynamic pose, foreshortening, extreme perspective distortion and exaggerated posing and anatomy. Obviously I do not know how much study you already have behind you. My experience is that to get to do this successfully, you need a couple of years of straight figure drawing from models or photographs. A book that I have been drawing from a lot in the past years is "Colossal Collection of Action Poses" by Buddy Scalera - it has helped my posing characters enormously. Looking forward to your next works!