Let start with:
Step 1: Open your Photoshop and make a new document size 10cm x 10cm resolution 72 pixels. Make a new background color with Gradient style as seen below
Step 4: Make sure you have create new layer (Ctrl+Shift+N) and your foreground is white before you start to brush.
Step 5: Using Custom Sharp Tool (U). Look for cycle like below object and draw it in white color where your white star is.
Step 6: I know some of you are regularly ready all my post. I always mention on how to make a layer mask like How to make a fire effect and How to create an effective logo and more about Photoshop style but yet if this is your first time I would warmly welcome.
Well to start this layer mask please look to your layer pallet the below there are shortcut and see below image you will understand
Then go to your tree and start mask it as you seen in below image to your result.