Ah, sorry. I'm slow today
I still think his tail and shorts could use more work. Make tail smaller/shorter in second, third, fourth stage, make it look like if it's growing. I think Thylacine tail is longer and slimmer anyway.
Also more changes in shorts like: stage 1: stay as they are, stage2: they get longer, stage 3: bottom part looks like rolled up, stage 4: add number, stage 5: belt.
Right now pants in stages 1,2,3 are almost the same, pockets are very minor change, adding number in 4th doesn't change much either. They are only clothes he is wearing, so it's important to make them stand out and change, playing with lenght and rolling up can do the trick for them.
I don't know what blush in second and third stage is for, if you don't keep it later. Since his chest is "empty" you might want to consider adding markings on it, maybe marks in shape of Thylacine foodprint?
On a side note: idk why, but I'd love suspenders on him X3
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