From centralcoastbiodiversity.org (Fretwell & Starzomski 2015): "The bushy cirri (projections) that adorn the long head of this prickleback are its main identifying feature. It also has cirri behind its head, on the first four spines of the dorsal fin. It is orange or brown with dark mottling and dark bars under its eyes and along its fins. Its body is elongated, with long low dorsal and anal fins, large pelvic fins, and a relatively small rounded tail fin. It gets to 42 cm long."
May be confused with the Mosshead warbonnet (https://www.inaturalist.org/guide_taxa/1401853) but that species "has less extensively-branched cirri on its head and first dorsal spines, and evenly-spaced eye-spots along its dorsal fin. The matchcheek warbonnet (C. tarsodes) is similar in appearance to the decorated warbonnet but is relatively rare in the Pacific Northwest and has not been recorded further south than northern British Columbia."
See the following link for a video of this species:
https://www.youtube.com/watch?v=0FWvSVFtBtk&feature=emb_logo
Likely to be observed in video based on kelp transect observations.