Yea, get them links fixed. Unless they're some sort of metaphor, then I don't get it.
Art Collectio, eh? Sounds like a Roman Gallery.
So your art for the different channels...the eytsh one is very good. Now did you Frankenstein that together? Because if you did, that's hardly your own work. Something in a portfolio needs to be your original pieces. They can be inspired by something, but they should be made from your own efforts, not relying on a different party to supply a fraction of the visuals. It's very misleading otherwise.
Your CnC zone work brings up a big point about a good deal of your content: it's very illegible. When it comes to color selections with lack of contrasts, effects that get in the way, or letters so foreign, they're hard to recognize as letters at all... you do have a few illegibility issues. Different fonts are cool and all, but they need to be formed in such a way that they're immediately identifiable.
Now those desktop backgrounds. Firstly: 1080p, my boney butt. Those are about 900x500 pictures, and they would barely fit a Gameboy Advanced screen. And also, they're a bit simple. The first two, the sub and the boat, looks like grey-scale toys with some particle effects around them. I do like the particle effects, but that shouldn't really be the highlight now. And the water effects on that boat are a bit... well... no. Your green P is about the same, in the contexts of not much happening. Your BOOP thing is alright. The blur effects behind them are a bit bad, but it's a bit different. Even though that symbol above the BOOP is... confusing. Is it some sort of M? A fox with two beady eyes? A M with two facing P's? Is it just two P's? Can I eat them? Stop blinding me with art... it hurts my brain hole.
I think the main problem you have is that you're not showing much of your own creativity. Like I watched the GFX BOOP logo time lapse (totally my invention), and it's all just using premade templates and effects, with some retexturing, lighting effects, and other knitted details. This means your work relies on what neat tools you have, rather than your own hand adding the details. In contexts of you getting hired to do work, an employer would prefer someone who doesn't rely on these templates or effects. They do look quite nice, since this is a community of amateur, practically self-trained artists looking at others of the same cloth. But on a professional level, people who hire are looking for so much more. They want to see you using simplicity and complexity effectively. When you have en empty space, you know how to aesthetically use it, or rather, not use.
I could also say something pretentious like "be more careful about your color selections, since colors give us feelings." But that's weird and probably dumb, so I won't. But yea, you need more practice / different ways to use your tools effectively. But being someone who sucks at art and does not actually employ artists, all of that is probably tosh anyway. But that's just my long-winded opinion. And what a long wind it was... no way I'm proof reading all dat'. Enjoy!