Open Photoshop in the computer/laptop. In Photoshop go to file and create a new document. The size of the document should be 600px width and 1000px height. The background should be white and resolution at 100px.
Open geometry options and select the ellipse tool. The width and height should be at 200px. A circle will be formed once the intersection of the guides are clicked on at the same time.
Vertical and horizontal guides should be placed in the middle of the circle that was just created. Having these guides will help you better understand how to transform the circle into the guitar's body.
The circle you created in the earlier step should be warped. In Photoshop go to Edit, then Transform, and then Warp. Make the circle look like like a guitar body. Don't be satisfied with the first shape you come up with. Keep at it till the circle looks more like a figure eight.
Now add color the the shape that was just created. Go to the Filters menu and select Render and then Fiber. The Strength should be at 64 and the Variance at 4. Apply Gradient on the shape to give it a natural wood grain color.
Create a new layer that will help your guitar have a 3D effect. The height and width should be at 100px with the elliptical marque tool. Move the layer you created next to the figure eight shape. Be sure to move holding down the shift key and using the arrow keys.
Again apply strength to 64 and variance to 4 for the Rosette layer that was just created. Don't forget to apply an inner shadow to the Rosette layer as well. The inner shadow effect will give the guitar depth.
Choose the elliptical marque tool again and create another layer. This layer will be going around the circle that was created in the center of the guitar. Although this time the height and width will be at 120px instead at 100px.
From the Photoshop menu select the Polygon tool, and use it to create the bridge layer for the guitar. Create a rectangle and go to Edit menu and choose Transform Path and then Warp. In the sides option change this to three as well as changing the color to black.
In Photoshop choose the select menu, then go to Modify and Contact. The value should be set at 3px, then blend the foreground with soft light and a shadow effect. The bridge should be a transformed triangle, but still have its three original points.
Set 425px height and width to 75px in the Geometry option for the neck of the guitar. Choose Edit then Transform and then Perspective and move the neck in place. Resize the neck to be wider at the bottom and thinner at the top. The neck shouldn't be left as a perfect rectangle because it will look out of place with the rest of the image.
The neck that was just created should be duplicated to form layer that is connected to the guitar body. The second layer should be liquified by going to the Filter menu at the top of Photoshop. This NeckSide layer will be filled with black to become a shadow.
Add rivets to the neck and to the rosette. Strings are needed to be placed from the neck to the rosette. The rivets should be created by making a small circle layer. Duplicate this layer as needed to create other rivets. Create another layer for the strings. This layer should also be duplicated to save time.