I think I can speak for everyone when I say critiques are always appreciated. Whether you're a traditional artist with brush or pencil, a 3d artist with Photoshop or Blender, or you make dumb little screenshots like me, a well thought out, constructive critique can help you grow as an artist. It can sometimes make you feel like a new mother being told she has an ugly baby but it's helpful to hear "maybe if you tried this..." or "this technique would work better here..."
With that said, no one needs to be told what they're doing is wrong or that something is bad. That's the difference between a critique and a criticism. A critique is helpful, encouraging and thoughtful. Criticism is the exact opposite. Critiques are meant to help you grow, criticism is meant to hold you back.
Recently I've been seeing comments left on a number of users' submissions from a certain someone that claims to be on a "crusade" to improve DA but whose only intention is obviously to stifle the creativity of others. This person with an empty gallery who freely admits to having no talent of their own seeks to discourage you, not encourage. They're goal is not to see you grow but to see you whither.
I'm writing this to tell you not to listen to the criticism. Don't let anyone stifle you. It's your creativity and your art, make the art that makes you happy. Be open to suggestions and new ways of doing things, be willing to try new methods and if someone makes a request be willing to consider it but don't ever let someone else control what you make. You're unique and so is your perspective. Your art should reflect you, no one else.