PHOTOS: Karl's top pics of 2021 - Top 10

Pittsburgh Steelers running back Najee Harris (22) stands on the sidelines prior to his first NFL start. I captured this intimate portrait using an 85mm f1.4 lens. The shallow depth of field gave me the ability to draw attention to every bead of sweat on his face. (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers linebacker T.J. Watt (90) continues to display his ability to wreak havoc on opposing offenses. He seems almost possessed after sacking Seattle Seahawk quarterback Geno Smith (7). (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers running back Najee Harris (22) runs with the ball during a regular season game between the Pittsburgh Steelers and the Cleveland Browns. The contrast of light with the dark shadows reminds me of the chiaroscuro technique used by renaissance artists. (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers kicker Chris Boswell (9) kicks a field goal during a regular season game between the Pittsburgh Steelers and the Baltimore Ravens. I lined up to photograph Chris between the line hoping that there would be a gap to see him through, I got lucky. (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers running back Najee Harris (22) hurdles Cincinnati Bengals cornerback Mike Hilton (21) during a regular season game between the Pittsburgh Steelers and the Cincinnati Bengals. This is one of many more hurdles to come in Najee's career. (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers quarterback Ben Roethlisberger (7) and Head Coach Mike Tomlin embrace in the locker room after clinching a wild card playoff spot following a regular season game between the Pittsburgh Steelers and the Baltimore Ravens. (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers safety Terrell Edmunds (34) waits in the tunnel prior to a regular season game between the Pittsburgh Steelers and the Cincinnati Bengals. I was inspired by the light pouring into the tunnel. I was shooting with an on-camera flash but I immediately turned it off and changed my settings to capture some silhouettes. (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers cornerback Joe Haden (23) intercepts a pass during a regular season game between the Pittsburgh Steelers and the Tennessee Titans. Joe Haden's team mates all watch as he dives to make the catch. (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers linebacker T.J. Watt (90) strips the ball from Buffalo Bills quarterback Josh Allen (17) causing a turnover. I love the clean background and how the players are isolated from everyone else on the field as T.J. punches the ball loose. (Karl Roser / Pittsburgh Steelers)

Pittsburgh Steelers quarterback Ben Roethlisberger (7) and his family leave the field following what could possibly be his last game at Heinz Field. (Karl Roser / Pittsburgh Steelers)