Lots of great guitar tones have been yanked from little
amplifiers. IMO, and 8" speakers is as small as the speaker should get and still get what you want. SM57, right in front, crank the amp as loud as you can stand it. Ive gotten pretty decent tones myself, but I can't stress the importance of experimentation to maximize your specific situation. Fender IMO, makes a better small amp than Marshall.