question mark head

---

Size: 5427px × 3502px
Photo credit: © marcos alvarado / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: abstract, answer, blue, brain, concept, creative, creativity, doubt, education, face, head, human, idea, illustration, intellect, intelligence, knowledge, man, mark, medical, medicine, mental, mind, mystery, person, problem, profile, question, science, silhouette, solving, symbol, technology