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Both start in the studio and cost nothing. You do not need an account, though without one you wait longer in the queue.
Same lesson, three subjects
Worked example Restyle an image you already have Hand the studio a picture you already have and let a model repaint it. How far it may wander is one slider.
Worked example Repaint part of an image Paint over the part you want changed and leave the rest of the image exactly as it was.
Worked example Render a subject with a transparent background Get your subject on a real transparent background, ready to drop onto anything.
Worked example Repair a small face during generation Ask for a face-repair pass in the request itself, and run the same seed with and without it to see what the pass changes.
Worked example Embed a QR code in art Make a piece of artwork that a phone camera still reads as a QR code.
Worked example Borrow a picture's structure Keep the shape of one picture and change everything else about it. A detector traces its edges, and the prompt decides the rest.
Worked example Blend images together Blend a picture with a handful of others and get a picture that combines them.