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mperfect Sage Mode
Jiraiya was not able to properly balance his own chakra with natural energy, resulting in him using an imperfect form of Sage Mode. As a result of the imbalance (and the imperfect nature of his transformation), Jiraiya took a number of toad-like traits when using Sage Mode. His appearance was altered: his nose grows bigger and gains warts, he gains excess hair (his goatee), and toad-like eyes. Further transformational attributes includes him taking on a toad-like stature and the lines on his face become much thicker, taking over each side of his face. Because of these traits, Jiraiya didn't like to use Sage Mode as it "displeases the ladies". He also showed the ability to transform his limbs (e.g. his hands and feet) into those of frogs so as to aid in manoeuvrability.
Perfect sage mode
Unlike Jiraiya, Naruto is able to perfectly balance the natural energy with his own chakra. This allows him to use the true Sage Mode, which retains all of his normal physical characteristics except for toad-like eyes: yellow irides, horizontal bar-like pupils, and reddish-orange pigmentation around the eyes; the mark of a true sage on each eye. A true sage would still suffer from the weaknesses of Sage Mode, requiring that they use Sage Art: Amphibian Technique in a battle situation. Because of the Nine-Tailed Demon Fox sealed within Naruto, however, Fukasaku was rejected whenever he tried to fuse with him.