Any tips on putting a shadow under a car/bike

This is a tough one. First, I'd remove the stand so it looked like the tire was on the ground.
Got a profile shot? I might try laying it down to the side to use as a guide to draw a shadow in. Use a big feather on the selection to soften the edges.
Did you think about taking one shot with a hard light to get a shadow to use as a guide or PS in next time?

Not sure where you would want the shadow to fall since the bike is lit from all sides. There are many ways in Photoshop to do it. I did this.

1. Duplicate the layer twice so that there are 3 layers
2. Make the top layer invisible a second.
3. On the middle layer, either mask out the white, or use the Magic Eraser to get rid of all the white.
4. Once the white is gone, on that layer, go to Layer Options for that layer and use a color overlay, pick a Gray.
5. Then on that layer, go to EDIT>TRANSFORM to resize and skew it so its where a shadow would be under the bike.
6. Still on the middle layer, do a glassian blur to softened it out a bit. If you want to reduce the opacity on the layer, fine too.
7. Now make the top layer visible. Using a mask, or the magic eraser tool, get rid of all the white again. The "shadow" should be under the bike now. Make adjustments on the shadow layer so it looks like you want.

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PhotosGuy wrote in post #12319047
This is a tough one. First, I'd remove the stand so it looked like the tire was on the ground.
Got a profile shot? I might try laying it down to the side to use as a guide to draw a shadow in. Use a big feather on the selection to soften the edges.
Did you think about taking one shot with a hard light to get a shadow to use as a guide or PS in next time?

I was going to remove the stand for a few shots that look like the model was riding on the street. I never thought of taking it out here. Good idea. I thought it might give it the floating look more.
I do have a profile.
I did not think about that actually that is on the list of safety shots to get.

kjonnnn wrote in post #12319241
Not sure where you would want the shadow to fall since the bike is lit from all sides. There are many ways in Photoshop to do it. I did this.

1. Duplicate the layer twice so that there are 3 layers
2. Make the top layer invisible a second.
3. On the middle layer, either mask out the white, or use the Magic Eraser to get rid of all the white.
4. Once the white is gone, on that layer, go to Layer Options for that layer and use a color overlay, pick a Gray.
5. Then on that layer, go to EDIT>TRANSFORM to resize and skew it so its where a shadow would be under the bike.
6. Still on the middle layer, do a glassian blur to softened it out a bit. If you want to reduce the opacity on the layer, fine too.
7. Now make the top layer visible. Using a mask, or the magic eraser tool, get rid of all the white again. The "shadow" should be under the bike now. Make adjustments on the shadow layer so it looks like you want.

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO

WOW thats 100x better than what I am getting.

Thank you so much for the write up. I was using an air brush

Thanks you two I have some ideas how to go about this

Needs work, but you get the idea. BTW, your files are aRGB instead of sRGB.

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Yeah the files are not dont yet. I just got them SOOC to see what i need to do.

Yeah I get it. I see the basic idea there