PICTURE ONE: Sketch in the remaining tufts of hair, round cheeks, clothes, etc. Keeping your guidelines, this is how the twins might appear. Congratulations, now you can erase them... carefully. Any lines you've missed, you can blend in as shadows if you want. -----------------------PICTURE TWO: This is how those precious children appear without the guidelines. Since you have gotten this far, if you feel you are finished then you can stop here. The next steps are pencil sketching, shading, and tone value exercises.