Weight lifting seems perfect i think? Focus on exercises that target the muscles/ area u want to tone. Ofc to make things rounder, you’ll have to consume a bit more protein as protein is essential in muscle development. Pilates can definitely tone! But it’s more of an overall tone. It also gives nice lines if you do it right, but I’m not sure whether it can build glutes etc. It’s good though, do give it a go! As always, losing weight is due to less calorie intake than use. So if you want to maintain your weight, you will definitely have to eat more if you decide to increase the amount of calories you burn. You gain weight by eating more than what you burn. Either way, exercise will definitely tone, but these things can really be spontaneous, just like how you can’t spot reduce, you also can’t spot build or control how your body reacts to the exercise/food. You can target the muscles you want to build but it will still have an overall affect on your body.
Do correct me if I’m wrong though, I’m certainly no expert in this area.