Dayanax,
Original work including Unseen is fine, as long as you're not commercialising or otherwise distributing it. If you are at all concerned, then providing the link, rather than including the image directly in the post, is fine (becase Lawyer).
Nice work! You do have the opportunity to grow your skills, but you're already doing very well. The overall layout and details are great, and a little work on the perspective elements will tie everything together. Looking forward to seeing more from you!
(And if I can slide in a bit of personal bias - I'd love to see more of the variants done, like the LL Commando, Jenner with chin turret, etc!)
Cheers,
W.