It looks like most of backsides have some problems..
Using frontside to make backside do it easier to make the backside, but if you aren't careful it will leave many mistakes.
however if you look his body is bigger at her backside and not frontside, also the paws doesn't look as the frontside shows.
This fire man is cute, however his body inclination ends up with his head in the wrong place.
Backside also need attention because looks like his head was hit by a hammer and entered the body, arms could be backwards.
I loved that hammer design!
Also, great design on those creatures, you always have great design on insects and aliens!