Ground-Type Muk is my favorite, I think it's actually an improvement. Love the bucket and shovel!
Grass-Type Venonat is cool, too, with the flowers and that single leaf floating away, but those eyes. It's an O.O expression that creeps me out, frankly.
Crustle's alright, but not too much difference to me. As for Pinsir, eh....it's not bad, but definitely my least favorite out of all these. That idea about electricity generated between the pincers would've been terrific, though!
I concur with what @Magpie and @Shiny Eevee have said - that Sand Muk is awesome. I like the extra details, like the bucket and spade. I also really like the Ice Crustle, I wish that was an alternate form. The other two are all right, but I must admit, they both look a little disturbing, especially Grass Venonat.
Ground Muk is amazing and should be a thing. Loving the bucket and spade, its easily the best of the four re-types in my option because it just works so well.Ice Crustle looks frost-bitten xD
And I agree with @Shiny Eevee, those Venonat eyes are staring into my soul!
Thanks Shiny And yeah, Pinsir is probably the worst of the bunch. I thought about making a spark of electricity between the two horns but at that point I had given up, haha. Plus after I made it I saw someone else's Electric Pinsir retype and it was way better and basically the same idea with the electricity. For Crustle I kept going back and forth between adding more sheen and taking it away, and in the end I guess it was a bit too subtle.
SANDY MUK is definitely my favorite of the bunch. For sure. The texture and the shovel with bucket is so well integrated. ♥ Venonat is also well done, the flowers are cute touch. ^^ (and those eyes that're staring into my soulllll)
I can't really tell that Pinsir is electric, though, minus the coloring. Similar with Crustle, though I guess you can't do much with Crustle if you wanted to give it an ice piece on the back ^^; Maybe a bit more of a sheen would help?