I can see why you had trouble.
Flareon is small and fluffy where Glaceon has more of a standard build and is very sleek.
Still though, all you did here was stick Flareon's fluff on a Glaceon.

If you want my idea's (and I'm perfectly aware you didn't ask, so ignore them if it bothers you) then:
Tail: Take Glaceon's tail and fluff it up a bit, like half of Flareon's fluff level, keep the two-tone color scheme
Head: replace Glaceon's center crystal with Flareon's little tuft, don't do neck fluff, use Fareon's ears, not sure if keeping Glaceon's side things would be better or worse
Body: Not completely sure what to do here, first instinct is to use Glaceon's design on Flareon's body-type but then it'd be too busy, too much going on in a limited space, maybe if you took out either the booties or the back diamonds?, alternatively just straight up rip Glaceon's body except for the color scheme
Speaking of overall scheme, for the texture, if Glaceon's fur is like smooth ice then combined with Flareon's fluff I get the image of fine ice crystals, the kind you get on a foggy winter day
The coloring is probably the most difficult part since we have all primary colors to work with so any blending would lead to other colors, I'm not even sure how you did the yellow-into-blue gradient on this piece without it turning into green (Good job on that, btw), the thing I'd do is have Glaceon colors on Flareon parts and vice-versa but that's just me