Please clarify if what I have mentioned below is correct.
I like painting. - Gerund?
I like painting pictures. - Present participle?
This subject has been already discussed.
In order to better understand the difference, let's look at each of their definitions separately.
Gerund: the -ing form of a verb when functioning as a noun, as "writing" in "Writing is easy."
Present participle: a participle form, having the suffix -ing, denoting repetition or duration of an activity or event: used as an adjective, as in "The growing weeds are nuisance to the neighbours", and in forming progressive verb forms, as in "The weeds are growing."
I like painting (pictures) - gerund - Yes, "painting" is being used as a noun.
Here's an example of "painting" as a present participle: "The weather began to change quickly as I was painting the landscape."