Before worrying about stylization, try sculpting rocks based on real world references. You should always try to understand the source materials basic forms / shape language before trying to bend or break the rules (ie. 'stylize' them).
Hey there, this is a nice start! I think what could help you the most is having a good balance of hard edges and soft spots. At the moment, I think your overall shape language feels a little soft, so while the details tell me rock, the silhouette of the rock itself seems more like a blob. I think some nice cracks could…