You are fine. It is better to take AP Chem immediately after chem HN imo b/c then you don’t have a year’s memory gap. If you have an interest in art, go for it. You don’t need to show more rigor, the school report will explain you took the max APs you could. Your schedule is fine as is and very rigorous (BC, chem, and USH are considered harder APs). Obviously UC Berkeley will be competitive even for the 1% but I think this will be considered pretty competitive .