Par toutatis ! So much violence... But Obelix doesn't have a dagger, doesn't need one, if you want to give him a weapon, a axe is more suited for this is the weapon he carries in the first tome of Asterix But the drawing is really really cool, I love how you added real celtic cloths and armors and weapons and tatoos, even the helmet, great idea and great execution ! Congrats !
You do put a lot of work onto the rendering of the piece and put a lot of attention into what the texture of the materials would be like. Something I do have to point out is the form/placement of some of the items. I would find it really unlikely that the dagger on the belt and the spear would be facing the "camera" perfectly sideways. Same with the severed head being turned at a perfect profile to our viewpoint. Also with the lighting in the background, there would be a bit of an aura or halo around the figure. Over all though, keep up the good work.