Fantastic Four #151 (Pt 22) Why It's...

         1966: Fantastic Four #52                       1974: Fantastic Four #151
Kirby                                                         Buckler

Fantastic Four #151 (Pt 21) Mahkizmo and Thor's Destroyer

1974: Fantastic Four #151 Buckler

1966: Thor Annual #2  Kirby

Fantastic Four #151 (Pt 20) Thoom Times Two--Mahkizmo and Sub-Mariner

1966: Tales to Astonish #82 Kirby

1974: Fantastic Four #151 Buckler

Fantastic Four #151 (Pt 19) Mahkizmo, Thing, Thor and Ulik

1974: Fantastic Four #151  Buckler

1967: Thor #138  Kirby

Fantastic Four #151 (Pt 18) Mahkizmo and Sub-Mariner Bend Over Backwards

1974: Fantastic Four #151  Buckler

1966: Tales to Astonish #83   Kirby

Fantastic Four #151 (Pt 17) Sub-Mariner and Human Torch

1966: Tales to Astonish #82 Jack Kirby   

1974: Fantastic Four #151 Buckler   

Fantastic Four #151 (Pt 16) Iron Man, Sub-Mariner, Torch and Mahkizmo

1966: Tales to Astonish #82 Kirby

1974: Fantastic Four #151 Buckler

Fantastic Four #151 (Pt 15) Sue, Medusa and Sleazy Guys In Hats

1963: Fantastic Four #10 Jack Kirby

1974: Fantastic Four #151  Buckler

Fantastic Four #151 (Pt 14) Mahkizmo and Gorgon

1974: Fantastic Four #151 Buckler

1965: Fantastic Four #44 Kirby

Fantastic Four #151 (Pt 13) Johnny and Reed Suit Up

1974: Fantastic Four #151 Buckler

          

1963: Fantastic Four #10  Kirby

Fantastic Four #151 (Pt 12) Big Ben Front and Center

1962: Fantastic Four #4  Kirby

1974: Fantastic Four #151  Buckler

Fantastic Four #151 (Pt 11) Suedusa!

FF#151 (1974) Buckler                                  FF #48 (1966) Kirby

Fantastic Four #151 (Pt 10) Mahkizmo and Galactus

Yeah, I know I've posted this before elsewhere--but it's a classic so here it is again!

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #49 (1966) Jack Kirby

Fantastic Four #151 (Pt 9) Thundra and Lightning--and Crystal

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #68 (1967) Jack Kirby

Yeah, these look similar mostly due to the Sinnott-inked faces. But there's also the matter of the elongated arms. What do you think? 

Fantastic Four #151 (Pt 8) Mysterious Medusa

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #44 (1965) Jack Kirby

Fantastic Four #151 (Pt 7) Medusa on the Move

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #44 (1965) Jack Kirby

Fantastic Four #151 (Pt 6) Don't Mess with Ben

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #9 (1962) Jack Kirby

Fantastic Four #151 (Pt 5) Ain't No Mountain High--'Nuff Said!

Fantastic Four #151 (1974) Buckler

Fantastic Four #69 (1967) Kirby

Fantastic Four #151 (Pt 4) Ben Is Bustin' Out All Over

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #68 (1967) Jack Kirby

Back in 1974, Marvel's Greatest Comics #51, which reprinted FF #68,  was on sale at the same time as Fantastic Four #150--so, about a month prior to FF #151 hitting the stands. I wonder, did readers of both mags connect the dots and notice the source panel?

At any rate, fans seemed to have really enjoyed the art on this mid-70s FF run. The Buckler-Sinnott Kirbyesque art was often lauded in the FF letter columns; and as one letter writer put it in Fantastic Four #164: "It's Rich Buckler's tribute to the style and excellence of the F.F. in their former day of greatness." 

Fantastic Four #151 (Pt 3) Ben and Johnny, Two For the Road

This one's a combo. The trench-coated Ben seems to be adapted from FF #68, while Johnny is from #44.

                                            Ben

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #68 (1967) Kirby

Johnny

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #44 (1965) Kirby

Plus, because FF #68 is used above, I feel it's the inspiration for this panel too. 

Fantastic Four #151

Fantastic Four #68