The spring

[Nacer Eddine]

[archonforest]

It is a good start I think. I like the 1st one
Two thing I would mention mainly on the 2nd picture. The ground is very plain flat. Some displacement/bumps would be cool. Then usually u do not see flowers like these in a forest. Seems to me one is a sunflower and the other one is a rose. I would replace those with some wild flowers with some grass.

[Nacer Eddine]

Thanks archonforest
i try to do my best.

[choronr]

Excellent details and light.

[TheBadger]

image 1 is very good.

[mhaze]

Nice lighting and good use of veg - like one best

[DannyG]

I like bits of both images. Great lighting. I would suggest scaling down all flowers in scene 2, a bit too tall.

[Nacer Eddine]

another one

[archonforest]

wow looks great! nice forest and great light

[Nacer Eddine]

now i will import obj file, example Tiger. the result

[mhaze]

The last woods pic is great - not sure about the tiger in the last one though!

[Nacer Eddine]

lets make tiger distance, how about this big elephant

[archonforest]

This one looks better than the tiger before(The tiger has different light than the environment...etc). Guess the elephant is a real object. The tiger looked like it was Photoshopped in the TG scene.

[Nacer Eddine]

may be, because its so difficile to find objects with very realistic detaills, and if i found it, its not free,
as I am not a professional so I use only the free obj

but with photoshop i can use the realistic photos but it will be very hard to put them in the 3d scene with different tilt . i have used it but with another program 
its can be some times very interessting to combin (2d with 3D) but it hard

this is a few tests between 2D and 3D with animation. can give some idea !!!!!
i know the bad quality, but its only to qive an idea to combin 2d with 3d scene