Here are links to some  patterns for spring and Valentine's day:

Hearts:

Christmas Heart by Anne Bruvold: https://nuperelle.net/EngPatterns.htm

Multiple heart and flower patterns by Muskaan: https://tipsaroundthehome.blogspot.com/p/patterns-designs.html

Multiple heart patterns by Tat-A-Renda: https://tatsaway.blogspot.com/p/hearts.html

Many heart patterns from various designers: https://www.theonlinetattingclass.com/hearts

Many heart patterns from Lilliantatlace (Love me tender motif, Love me tender bracelet, Love Together, Daisy Heart, Waffle Heart, Spring Flower Heart): https://lilliantatlace.wordpress.com/ 

Many beautiful heart and rose patterns by LacerockerShoKo, there is no website that I can find, the patterns are posted on their Instagram account: https://www.instagram.com/lacerockersho/ There are many beautiful things but go to February 2, 2023 for the Always Have Roses in our Hearts pattern.

Simple Filigree Heart by Marilee Rockley: https://yarnplayertats.blogspot.com/p/my-free-patterns.html

Heart using block tatting by Jennifer Williams: https://www.cariad-tatting.com/

Flowers:

Flat Carnation by Marilee Rockley: https://yarnplayertats.blogspot.com/p/my-free-patterns.html

Summer Bracelet, Daffodil Brooch, Daffodil Pin, Tatted Rose by Jennifer Williams: https://www.cariad-tatting.com/

In Corina Mayfeld’s blog, go to Saturday, April 11th, 2015 for the entry titled Long Time Not Here for a flower bracelet (the example is in black but would be gorgeous in any color). https://cmhandmade.blogspot.com/

Multiple flower patterns including wild pansies and red clover: https://pitsibaa.wordpress.com/free-patterns/

Several beautiful flower patterns including 3d flowers (near the bottom of the list, just keep scrolling). https://danielamendola.blogspot.com/p/free-pattern.html

Multiple leaf patterns and flower edgings on the Le Blog de Frivole found at https://leblogdefrivole.blogspot.com/p/patterns.html

I found a realistic fuschia flower pattern on The Tarnished Tatter blog (more patterns can be found in the dropdown menu on the right side of the blog): https://thetarnishedtatter.blogspot.com/2008/08/25-motif-challenge-7-of-25.html

This is a YouTube video from My World in My Way for a layered flower and it has an interesting way of putting the layers together, the link is https://youtu.be/3LCBNuh_7Yk?si=l9E2FdFtMD_AClHn