Do you mean the picture of the Bulldog ? Do you prefer the existing Bulldog face ?
Ignore the toe sticker.
Sounds like back to the drawing board !!!
The design process is always very subjective. I always hate designing to a committee, so well done for asking for peoples comments.
I like the new bull dog, but it feels more stern and its a tradition illustration (unlike the rest of the sticker set). The old bull dog was more modern and fun. It depends what your brand is all about. Whenever I do any design work, I always start with the brand ideals and message.
I do think that the fake metal reflective surface on the grading sticker doesn't help with 1980 look to the grading stickers and they are a little out of proportion.
On a good note the colours and main stickers are very eye catching and I like their aggressive/angled shaping.