Hi and welcome
I’ve just had a quick look at the pink polka dot dress and I must say you have only really used one photo. You need to use all 5. Customers can’t pick up your item they can only go on your description and photos. They need to see an overall shot, close up of different bits and of course the back/reverse side.
The title doesn’t say baby dress which means it will not show up when someone types baby dress into the search box.
The ribbon appears to be pink not white as in the description but that might be my monitor.
You might want to put the sizes in both imperial and metric.
As for price of the dress that looks about right to me but then only you know how much it cost you in materials, how much time it took to make and if you’ve accounted for paypaly charges and folksy fees.
As for postage if you’ve charged what it costs in postage and added on whatever it costs in packaging materials then that’s all you can do.
Don’t worry too much about mannequins and models for the moment. Laying the dress out on a plain background is fine and you can also try using a baby/toddler clothes hanger like I have with my baby crochet cardigans. You can get a small pack of 5 for a couple of pounds on ebay.
I would suggest filling out your meet the maker section.
Some of your photo’s the background is rather dark. Try taking your photo’s in natural light even outside.
Dark colour backgrounds can be great for white items. Try to keep your backgrounds as uncluttered as possible as they can detract from the item being sold.
I would recheck your grammar and punctuation in your descriptions there are a few spelling errors and you have forgotten to use capital letters at the beginning of your sentences.
I hope some of that helps and all the best with your new shop.