Really appreciating your bold collage aesthetic! Besides the striking central figure (Venus herself? an embodiment?), I find my eye drawn to the abstract symbols marking the clock—is this how Venus views time..? OOoh and I do like the circled eye/vertical line motif mirroring the clock with vertical line.
What would you define as a "mistake"?

I feel like at a certain skill level (yours!), there aren't definitive mistakes in design, at least not for personal work. Unintentional elements, I guess, but ofttimes they work out!