You actually have a really solid grasp of proportions for the most part and your framework looks good!

My only big critiques would be:
1. Thumbs! Looks like you have at least one of them on the wrong side of the hand? I may be wrong. If you're ever in doubt, put your hands in the same position and take note. I have to do that a lot.
Relatedly, the hands are a bit small in proportion to the rest of him, even taking transformation into account. I have no idea what size hands "should" be, I just go by looks, but the middle finger should generally be the same length as the palm. The palm is usually about the same width side to side [without the thumb] as the length of knuckle to wrist. I could draw up a little basic tutorial about how I draw hands maybe? If you think it would help. I have a lot of hand refs and tutorials in my favorites folders on deviantArt as well.

2. Ears. Animal ears don't sit right on the tops of their heads, and often in TF art will start much lower, around where human ears are, and then move up as the TF continues.
   In my art, I sometimes draw them a bit too low, actually, so I'm not the absolute best person to listen to [photos of wolves are], but where you have them is almost perfect, just rotate them outward a tiny bit and move them down a couple cm. Hard to explain in text, bah!
   I know there's a really good tutorial out there about this but I can't remember who did it off the top of my head. I'll look for it when I'm not on my phone.

3. This is kind of nitpicky maybe idk, but when people sit with their knees all the way up, their knees generally reach their collarbones. They way you have them here, they reach about the bottom of his ribcage. However, a lot of times when I try to draw them as long as they "should" be, things look weird, so always use your own discretion. In this case, there is a bit of a perspective thing going on, so I wouldn't end up drawing them too much longer here, but it's something to keep in mind.
   [You've done well with the arms but I've always found it handy to measure elbows to bottom of ribcage, fingertips to mid-thigh so I figured I'd mention that in case it helps you in the future too! All bodies are different so none of this is hard and fast, but it's a good starting point.]

And for teenier critiques that mostly will come as you practice more...
Clothes generally rip at the seams first, which you have shown pretty well, but they're less likely to have the hem rip first. Like on the right shirt sleeve, it probably wouldn't rip from the bottom there.
That said, I'm not sure you've actually drawn him bulky enough to have ripped his clothes as much as they're ripped yet. It's likely he'd rip the chest and thigh areas first, possibly the calf and shoulders as well.

And for non-critique! The perspective you have going on here, the foreshortening of his thigh and everything look really good. Despite the minor anatomical/proportional issues, the viewpoint reads very well and is not confusing or displeasing to look at.
Great expression! That's probably my personal favorite part. The posture, expression, limb placement...just all of the body language conveys the emotion very well.
And this is a weird thing to say maybe, but you did the bend of his back really well. That's something I struggle with sometimes. :)

My only really solid suggestion would be to just keep practicing. Do some studies on things like muscles [attachment, overlap, placement,etc.], clothing folds [and other cloths like towels], hands in different positions, different species animal heads...these are just general suggestions if things I've found most helpful over time. If you're drawing every day, that's perfect! Just keep at it and you'll notice a ton of improvement in a short amount of time, I think.

Also if you'd ever like to ask me anything or would like a redline, just let me know!