Here are some tips to help you become an organized seller, paying attention to detail and make your business look more serious, which will reflect on trust from your clients and prospected clients as well:
Clean your items and display them neatly, on a rack or on a table;
Place the price tags in each product individually or collectively, so it is visible and clear to your customers;
Sort your items by category, for example: eye shadows; pencils, foundations, mascaras...
Advertise the sales: let the people know beforehand where the sales party will take place: Use Facebook, Craig's list, or send a personalized e-mail to your established clients, friends, co-workers, etc.
Don't clutter your items, find a balance between the amount of products you have for sale and the opportunity for them to be seen.