>>1336267>>1336039When you finish with gypsum shapes, consider drawing various still life start from simple pencil, but don't be afraid use colorful paints for them later.
At this time, you will probably already have the well-devoleped skill. So sketch, especially sketch humans, this also helps to develop your skills (there are plenty of sites with pictures to sketch, for figure drawing better start from anatomical dolls). Just remember that for sketching humans I would suggest concentrating more on gesture rather proportions, but for architectural sketches right proportions are key to obtaining a recognizable image, so don't bother with small details here.
And as anon mentioned
>>1336249 drawing is applied skill, so don't stick in some one area, participate in life drawing sessions, post in draw-threads, copy artists you like and even try to develop your own designs.