I like them, your lighting and positioning of renders to create flow is on point. The only flaw I see is with your text on some of the pieces. The solid white doesn't blend and seems to contrast, drawing focus away from the focal point you created. There's a few of them I would add a layer, sharpen the edges maybe a bit and then set it to overlay and play with the opacity percentage?
You're right, some of them have several errors! These are all done after i "quit" the tagmaking! I haven't worked hard on these tags. I generally add a font on the part i like more of the tag, with the purpous to add "indirectly" focus on contrast produced bu the font. In past i usually male two versions of the work, one with font and another one without it.
Thank you very much for these advices, i consider these aspects on the next pieces! : :
Thanks to all of you guys! Maybe i consider to partecipate to sotm, when i find time for do some pieces!