This is really cool! I love the design of the character here and feel it was a pleasant change. The shading is consistent and the lines do a good job of communicating the flow of the character and his clothing. Has a really nice feel to it.
One thing I would recommend, as reference for future work, is to adjust the posture the character holds whilst wielding a firearm. When firing the weapon, especially rifles and other longarms although it applies to smaller weapons as well, the recoil effects the entire body, not just the weapon and lower arm. In order to maintain an proper sight picture and to keep the weapon properly steady, the shooter will lean into the weapon, as well as putting the bulk of their body behind the firearm. In the picture, Hector is portrayed in a weak rearwards lean with mostly his shoulder and right leg behind the weapon. Firing from such a position with either weapon would likely leave the muzzle loosely bouncing and make it more difficult to line up a followup shot.
It's not a huge mistake by any means and you did a good job on the art itself, but it's something to keep in mind. You can find lots of good reference material via videos of military personnel, or similarly skilled shooters, operating their weapon as they will almost always exhibit this.
Sorry to leave you a wall of text on that one thing, but it's a bit of a pet peeve of mine XD Like I said, other than that, great job!
Well you can find them online for around 650-700 us dollars which for a sniper rifle isn't all that bad. Most are bought from Russia so, as long as there is no laws saying you cant own on where you live, it should be relatively easy to get one.