I would have to say that if the feet are the only problem then you don't have far to go. However, and speaking from experience, if you stop improving you may as well stop drawing. I think you have accomplished much and have untapped potential. You clearly have talent. I found that it helped me to get the shoes and boots & gloves & clothing right if I first started with the basic fugure. Find some books on figure drawing and foreshortening, take drawing classes weather in school or not, work on still life drawings, they will help with things like swords and pistols and ...well everything. If you can't take a class just keep drawing and doing just what you are doing ...having others critique your work.