Nothing u could improve here. Same metal,new chaotic wood with no lighting or else. Crappy screenshots on low graphics. If u're bored - dont make skins.watch tutorials of how to make skins,

Fanta has different bottle shape + Texture looks blurry/lowres.

Model looks perfect,still there are smoothing errors in hole areas. Texture seems nice but lacks contrast a bit,mb lil bit blurry. Good idea to make it for cz. Hand position seems kewl 2.
Oh and some texture missalignments are noticable.

To begin with - way to blurry m no deatils on the metal like scratches,or may be dirt,no proper lightingat all. For modern - it needs a lot of work to look modern like . No colors,lettering and stuff. It looks like skin is only 50 % made and the rest is supposed to work on pre existing bumps

Animation: Animations are perfect here- realistic and interesting
Model: Model seems good - polycount is nice.
Texture: Texture look pretty oldschoolish,may be BF2 ish,not realistic. Remaking texture might make this gun look way better.