Hi, there dear! Probably a little late and also irrelevant so late in the month, but do know that this user could potentially be an art thief.
Their styles are just WAY too different beyond compare, and not that style inconsistency is uncommon, but this person has way too many art styles to be even believable.
And as for advice? Just my two cents; just study using photographs, books around or based on drawing, and practice, practice, practice!
Have a wonderful day! <3