Awww, now that is one awesome Herdier. The coloring is pretty nice, too; I think the only thing I would do different in hindsight is lighten the line color of the light cream color on its face, or possibly desaturate it a little. It looks slightly green, and it's tough when you're dealing with lineart for creamier colors, because darken it too much and it'll look either really dark yellow or green. But, at the same time, making it look too light doesn't fit with the rest of the outline, so it's a tough one. Yeah, well I hope that helps somewhat, and keep up the good work!

I see what you mean about the mustache's line. I thought it looked alright, but now looking at it, it does seem kinda off. This was one of my earlier practices (hence the sloppier sketchy line art), so I didn't think about changing the line's colors to properly match the base colors at the time, I was experimenting with different overlay colors to hopefully make it more interesting.

Again, thank you for the feedback!

Oh yeah, like I said, it's one of those tough things. I hope you don't mind the input; I noticed on your profile that you liked it, so I figured, hey, I may not be the greatest at art or advice in the world, but even little things can help for future improvement, and so few people nowadays take it well, haha. Keep up the good work!