On the Spidey PF, the spider on the back should have been done differently, either a patch or embroidered. The way it is now bugs me to this day.
Wolvie VS Sabretooth Dio would have been cool with a yellow costume version. The one custom I have seen looks incredible!
The Cap vs Red Skull dio could have been done with better teeth on Cap.
I'm gonna stop now, could do this all day...