Check out this screenshot (Heroes 3 + Photoshop).

Cool, Heroes 3 is awesome, and the picture is good too... It's just that the archangel from the fifth game clearly doesn't fit in, meaning: if you want it to be there, then add some other creatures from Heroes 5, and it will become a kind of mix of 3 vs 5, which, in my opinion, is not bad, but if it's just one creature, then it doesn't look good at all...
But this is just my subjective opinion, and overall I liked it...
Good job...