Welcome to z-world
It’s all about being patient, and taking care of the major forms of the pieces you want to make. There is no trick on this, but there are some things that really help (the best forum members always say this)
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Learn how to draw or sculpt - This will make you pay mor attention to the big forms and small details
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Study anatomy - Even if it is a monster, a dog or a human, it has bones, muscles and some times mechanical pieces inside of it. The main form starts with that, and the skin and clothes come over it
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Use your lowest sub-level - For the main form and silouethe, use your lower subdivision levels, for medium detail such as big wrinkles and muscle groups, use a mid subd level, for hi res detals (pores, wrinkles) use the highest subd levels