Well this is a cool but simple skin, let's dive in:
The Good:
There does appear to be some freehand which is really appreciated and it's been done to a pretty good standard, this isn't just a simple re-colour which is appreciated. Obviously large parts are re-coloured but the re-colouring has been done well.
You've added some variation such as the red bulbous bits and the furry lower clothing sections. You've put in effort which is clear to see and is good!
Another variation has been added for a red and green version which is cool, so if one wanted to either replace the original or have maybe an alternate version of the original red doomguard that's now also a possibility.
Areas for Improvement:
Sadly it's doesn't fulfill the >75% freehand needed for Recommended.
I feel like the icons could be a little clearer/more well defined, they're a little hard to make out atm.
Conclusion:
I like what you've done here and this texture will definitely be useful for people looking for an alternative Doomguard. More freehand is always the way to go and you're off to a good start. Approved as Useful/Simple.