You know, someone already tried this at the very beginning of the workshop...it didn't go too well....
in general i think Valve would have some copyright problems to accept Dota 1 versions of the heroes...
besides that it looks well crafted....
It really does look well crafted, however, the general style, from what I see, is a life-like realism. My advice is to try and rework the style of the pieces to be a little bit more Dota 2 styled. The game has a realistic shader, but the forms and shapes tend to be cartoony, exagerated, with a distinct "line". I can easily see your work getting accepted if you work a little bit on these cues I mentioned here.
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in general i think Valve would have some copyright problems to accept Dota 1 versions of the heroes...
besides that it looks well crafted....