Yes! Makeup with SPF provides a great base but even when wearing makeup with SPF, you must remember to reapply a sunscreen like Hello Sunshine every two hours, or more frequently if you're sweating heavily or swimming. 
Applying the right amount of sunscreen and reapplying is the key to appropriate coverage. Layering Hello Sunshine over IT Cosmetics CC+ Cream does not increase the duration of sun protection, so you still must reapply SPF every two hours. Also use additional sun protection measures such as wearing a wide-brimmed hat and seeking shade during peak sun hours.