MY NOSE OR SMILE ALWAYS LOOKS CROOKED IN PHOTOS––CAN YOU FIX IT?

Within reason, yes. Small changes work very well. Drastic alterations might look distorted or fake. Too much of a change might misrepresent you, especially if people see your portrait first, then meet you in person. I can supply you with a side-by-side comparison of what the camera got and the proposed Photoshop alteration, then you can decide for yourself which you prefer.