spiiderman is really hard to draw. I like your drawing of spiderman enough but because of his costume it is really easy to see where you went wrong with the shape of his chest and head.
the spiderwebs have to mimic the shape of his body.
also his neck is off. you might say that it looks that way because dr. doom is squeezing him, but to get his neck that distorted doom would be practically killing him. crippled spidey after this.
doom is pretty solid. I would make his left hand stand out more. Because it blends in too much with the arm behind it.
all in all good work! spiderman is insanely hard to draw and I like the folds, and value change on doom