Check first: Always ensure you know what's behind your wall before hammering or drilling. Avoid electrical wires, pipes, or studs unless you intend to anchor into them securely. Use a stud finder if unsure, especially for heavier items.

Fixes: For crooked frames, use museum putty on the bottom corners to secure them. If the wall looks cluttered, remove one or two smaller pieces to give the others more breathing room; if sparse, consider adding a small piece or two to fill a specific gap. Always use paper templates to avoid wrong holes. For falling frames, verify you're using hardware rated for the frame's weight and that it's properly installed. Measure the spacing between templates on the floor or wall to ensure consistency.