For rich and creamy soup you can add little more heavy cream but more cream downplays the oven roasted taste
Cherry/plum/vine or any other tomatoes can be added. Peel the skin if you are using vine/plum tomatoes for smooth texture
If the tomatoes you are using are sour add little more sugar or heavy cream
Tomato paste can added while boiling tomato soup for extra flavor and color
If you are using canned tomatoes avoid roasting
Carrots can be roasted in oven along with tomatoes, onion and garlic
Coconut milk can be used instead of heavy cream for vegan version and butter can be replaced with oil