Final answer:
The narrator feels that his drawings are crude and lacking nuance, evidenced by his use of terms like "loud-mouthed cartoons" and comparison to primitive actions.
Step-by-step explanation:
The word choices in the sentence suggest that the narrator's feelings toward his own drawings are ones of dissatisfaction and self-criticism. Terms like "loud-mouthed cartoons" and "devoid of language" imply that the narrator sees his work as crude and lacking nuance or artistic sophistication. The comparison to "cavemen grunting and swinging clubs" further emphasizes a primitive and inelegant quality that the narrator perceives in his own art, contrasting with a desire for eloquence which presumably would be expressed through a more refined and articulate visual medium.